That's why pennies made before 1982 with mainly copper (except the 1943 penny) are relatively safe to swallow. The Standard is an affordability measure and an alternative to the official poverty measure. So, it consists of atoms of different elements. What is the density of the solid in the image if the mass is 40 g? What are mass and volume? If one jar of this product contains 454 g of solution, how much #NaOH# does it contain? We can use this as a conversion factor (but don't forget that it's based on 100 g of compound!) Consider an generic molecular formula: AxByCz. Thus, it helps in chemical analysis of the given compound. Percent composition tells you by mass what percent of each element is present in a compound. What is the percentage composition of ammonium nitrate, #NH_4NO_3#? Therefore, in \(PCl_5\) is 14.87% phosphorus and 85.13% chlorine by mass. Example 1: For the compound (Ca(OH) 2) or calcium hydroxide, find . due to variations in gravity and acceleration. What is the percent composition of #(NH_4)_2S#? What is the percent composition of Carbon in aspartame #C_14H_18N_2O_5#, an artificial sweetener? #"50 g"# of #"ZnS"# are strongly heated in air to effect partial oxidation and the resultant mass weighed #"44 g"#. It even affects your health because bone density is very important. Courier Dover Publications, 2002. What is the percentage metal content by mass in aluminum sulfate? How can I calculate the percent composition of C2OH4? What are the smallest and largest volumes of 0.15 mol/L silver nitrate solution required to react with 0.3 g of a mixture of potassium chloride and barium chloride dihydrate? We cannot understand density until we know its parts: mass and volume. What is the percent by mass of nitrogen in #NH_4NO_3#? It is more than just the amount of chlorine in your swimming pool because it concerns everything from the money in your pocket to your health and how you live. To calculate the percent composition, we need to know the masses of C, H, and O in a known mass of C 9 H 8 O 4. Here, %CE is the percentage composition of the element E, that is to be calculated. What is the mass percent composition of aluminum in aluminum oxide? C 2 H 2? Now, the total mass of each element is the molar mass of that element times the number of atoms of that element. Cerebrospinal fluid (CSF) function is multifactorial. The basic equation = mass of element / mass of compound X 100%. Quiz: Which Premier League Team Should I Support? How many grams of N should be found in the new 2.0 g pure sample? A 25.0 g sample of an aluminum/mercury amalgam used for filling cavities is 7.00% mercury by mass. Since the newer pennies are made mainly of zinc instead of copper, they are a danger to a child's health if ingested. What is the percentage composition of #(NH_4)_2CO_3#? The picture below illustrates the same. Table \(\PageIndex{3}\) below gives the densities of a few liquids to put things into perspective. The atomic weights used on this site come from NIST, the National Institute of Standards and Technology. A sample of an iron oxide weighing 0.982g is found to contain 0.763 g of iron. What is the percentage of oxygen in copper oxide? What is the percent by mass of water in barium bromide tetrahydrate #BaBr_2 * 4H_2O#? Multiply it by 100% to get percent composition. How many grams of gold should a coin of 35% gold be if when combined with a 3 grams pure gold necklace, it forms a metal that is 69 % gold? What is the molecular structure of #XF_5#? This explains why ice floats to the top of a cup of water: the ice is less dense. And (ii) given a #1.00*g# mass of this salt, how many formula units does this mass represent? Please enable JavaScript in order to use this website. Below is a table listing the density of a few elements from the, Chande, D. and T. Fisher (2003). After heating, there were #8.43*g# of salt remaining. What is the empirical formula and the molecular formula of this compound? ", Richardson, J., S. Gwaltney-Brant, et al. As you can see, the copper is vastly unharmed by the lemon juice. Make your answer have 3 significant figures. The mass of copper obtained was was 1.6 grams. To find the percent mass of fat in the whole food, you could divide 3.5 grams by 15 grams, and see that this snack is 23.33% fat. When calculating molecular weight of a chemical compound, it tells us how many grams are in one mole of that substance. The percent composition of an element in a compound is the ratio of the total quantity/amount of . Calculate the % composition (by mass) of Mg in Mg3(AsO4)2? common chemical compounds. Calculate the mass of oxygen in a molecule of #"CO"_2# by using percentage composition? Just as people confuse mass and weight, they also confuse scales and balances. If the formula used in calculating molar mass is the molecular formula, the formula weight computed is the molecular weight. If you mixed 80 tons of sand, 12 tons of rock, and 4.0 tons of cement to make concrete, what would the percent by weight of sand be? With a manual balance, you find the unknown mass of an object by adjusting or comparing known masses until equilibrium is reached. AUTOR , ARQUIMEDES , and Thomas Little . Finding molar mass starts with units of grams per mole (g/mol). What is the percentage of ammonium ions in ammonium dichromate? Why is percent composition important in chemistry? How do you calculate the percent composition of water? Consider 100g of the compound. The nutrition label found on the container of every bit of processed food sold by the local grocery store employs the idea of percent composition. What is the percentage of carbon by mass in citric acid? The rest of the mass is oxygen. The molar mass MH2O of water is as follows: The percentage composition of hydrogen in water is calculated as follows: Note: Sum of %composition of each element is always equal to 100%. 11) Below is a model of a pyramid found at an archeological dig made of an unknown substance. What is the percent water in the compound barium chloride dihydrate? 75g of potassium nitrate are dissolved in 150g of water. People could melt copper pennies and sell the copper for more than the pennies were worth. Looking at the table, you can also see that ice is less dense than water. If it has a smaller density, it will float and displace a mass of liquid equal to its own. % C E is the percentage composition of element E. ; g E is the total amount of element E present in the compound T.; g T is the total amount of all the elements present in the compound T.; Mass Percentage (w/w)% To describe the concentration of an element in a compound or a component in a combination, we utilize the idea of mass percentage composition. Atomic Mass: 32.065 Water has 2 molecules of hydrogen, and one mole of water is of 18.0152 grams. If #4.57*g# of glucose are dissolved in #25.2*g# of water, what are the mole fractions, #chi_"each component"#? a. Mass Percent: 29.674%. To find the percent composition you divide each part by the whole and multiply by 100 to convert to a %. For example, if you had a metal cube with mass 7.0 g and volume 5.0 cm3, the density would be, \[\rho = \dfrac{7\,g}{5\,cm^3}= 1.4\, g/cm^3\]. What is percentage content of carbon by mass in #Ca(HCO_3)_2#? The molar mass of CuBr2 is as follows: The percentage composition of copper in copper bromide is calculated as follows: Mole percentage composition is a mole percentage of each element in a compound. What is the atomic weight (mass) of each element? What is the percent of gold? Unless otherwise stated, answers should be in g/mL or the equivalent g/cm3. Molecular weight calculation: Symbol: F So, the empirical formula is C2H6O. g E represents the total amount of element E present in the compound and g T represents the total amount of all the elements present in the compound. What does percent composition tell you about a molecule? What is the percentage by mass of phosphorus in a washing powder, in which a 0.085 g precipitate of magnesium pyrophosphate forms from a 2 g sample of powder? Of course, you have to know the density of an element with respect to other elements. If you are curious as to why the density of a pure substance could vary with temperature, check out the ChemWiki page on Van Der Waal interactions. What is the percent potassium, chromium, and oxygen in #K_2Cr_2O_7#? A. A78.0-g sample of an unknown compound contains 12.4 g of hydrogen. The reason is that the molar mass of the substance affects the conversion. What was the mass of oxygen gas that escaped? This can be written as. A compound is a pure substance made up of different elements. 92.31% Carbon and 7.76% Hydrogen B. Other relevant indicators: Family size and composition (SF1.1); Fertility rates (SF2.1); Mean age of mother at first childbirth (SF2.3); Childlessness (SF2.5); and, Marriage and divorce rates (SF3.1). common chemical compounds. Here, the quantity is measured in terms of grams of the elements present. How do I find the percentage composition of Nitrogen in N_2O5? Yet, it is clear that the zinc was partially dissolved even though it was in the lemon juice for only a limited amount of time. Similarly, percent composition is commonly used to make animal feed and compounds such as the baking soda found in your kitchen. Atomic Mass: 18.9984032 What is the percentage composition by mass of water in #CaSO_4*2H_2O#? What is the mass percent oxygen in sodium carbonate, #Na_2CO_3#? It is a fatty acid having ten carbons attached to form a straight chain. When using chemical formula it is possible to calculate the percentage composition of the chemical. How do you calculate the percent composition by mass of each element in #Al(OH_)3#? If a .500g sample of citric acid containing only carbon, hydrogen, and oxygen is burned to produce .687g #CO_2# and .187g #H_2O# what is the percent composition and how do you calculate it? What is it percentage concentration? What is the mathematical formula for calculating mass percent composition from a chemical formula? Regardless of the sample size, density is always constant. We use the most common isotopes. PROBLEM 4.4.1.12. Calculate the density of a .03020 L sample of ethyl alcohol with a mass of 23.71002 g. Find the density of a sample that has a volume of 36.5 L and a mass of 10.0 kg. Video from: Noel Pauller. How can I calculate the percent composition of water in a hydrate? What mass of oxygen is found in #"1.36 g"# of #"MgO"#? A sample of sodium fluoride produces 34.5 g of sodium upon decomposition. The formula weight is simply the weight in atomic mass units of all the atoms in a given formula. For bulk stoichiometric calculations, we are usually determining molar mass, which may also be called standard atomic weight or average atomic mass. The copper coats the outside of the penny while the inner portion is zinc. What is the mass percent of hydrogen for #C_3H_5OH#? Percent composition in chemistry typically refers to the percent each element is of the compound's total mass.. Atomic Mass: 18.9984032 The Daily Value is based on a the mass of each category recommended per day per person for a 2000 calorie diet. Example1:For the compound (Ca(OH)2) or calcium hydroxide, find the per cent composition of the element Calcium(Ca). What is the percentage composition by mass of nitrogen in ammonia? 32.065 + 18.9984032*4, Element: Fluorine A solution of salt and water is 33.0% salt by mass and has a density of 1.50 g/mL. g, Given that the chemical formula for calcium hydroxide = (Ca(OH), Using this value, we calculate the percentage composition of. Functional groups: D, Ph, Me, Et, Bu, AcAc, For, Ts, Tos, Bz, TMS, tBu, Bzl, Bn, Dmg. Skills Practiced. Formula weights are especially useful in determining the relative weights of reagents and products in a chemical reaction. What is the percentage composition of a compound containing 32.0 g of bromine and 4.9 g of magnesium? And since density=mass/volume , the lower the volume, the higher the density. We only need the molecular formula of a compound to determine it. How can I find the percent compositions of Al2(SO4)3? What is the mass of hydrogen in one mole of aluminum hydroxide? also explain why? How do you calculate percent composition of a compound? of any compound expresses its composition in terms of all the elements present. This site explains how to find molar mass. Chlorous acid, #HClO_2#, contains what percent hydrogen by mass? What is the percent composition of Ethyne? What is the percent composition of #Na_3PO_4#? Consider an example below. H = 4 x 1 = 4 The chemical formula of ilmenite is #FeTiO_3#. How do you calculate the percent composition of lactose, #C_12H_22O_11#? How do I find the percentage composition of Oxygen in #N_2O_5#? How do you solve this titration calculation? Solved Examples. If 1g sample of limestone was dissolved in acid to give 0.38 g of #"CO"_2#. A compound contains only an unknown metal and chlorine. Liquid water also shows an exception to this rule from 0 degrees Celsius to 4 degrees Celsius, where it increases in density instead of decreasing as expected. Percent composition tells you by mass what percent of each element is present in a compound. A chemical compound is the combination of two or more elements. Following is a picture outlining these ideas. A compound is formed when 9.03 g Mg combines completely with 3.48 g N. What is the percent composition of this compound? How do you find the percentage composition of a compound that contains 17.6 g of iron and 10.3 g of sulfur? A sample of a compound analyzed in a chemistry laboratory consists of 5.34 g of carbon, 0.42 g of hydrogen, and 47.08 g of chlorine. MgO Lab: How would your calculated value for the percent composition of magnesium oxide been affected if all the magnesium in the crucible had not reacted? the enol content of which is greater i)1,3,5 trihydroxy benzene ii)1,2,4 trihydroxy benzene. The residue remaining in the container weighs 1.459 g. What is the percentage of oxygen in this metal chlorate? # of Atoms: 2 The mass for each category, except Protein, is then converted to percent of Daily Value. The following two sections will teach you all the information you need to know about volume and mass to properly solve and manipulate the density equation. How many grams of H are there in 23.5 g of #H_2O#? When 150 #cm^3# of water freezes, 162 #cm^3# of ice is formed. The percentage composition is the mass percentages of each element in a compound. What is the percent composition of the compound? The penny, being only one cent, is literally not worth its weight in copper. What is the percentage composition of #CuCl_2#? What is the mass percent of hydrogen in ammonium phosphate, #(NH_4)_3PO_4#? But what is density, and how can we determine it? The contaminated sample is then treated with excess #"AgNO"_3#(aq). "Have a Penny? What is the percentage of hydrogen in the compound? It has applications in soap, perfumes, lubricants, greases, pharmaceuticals industries. The solder once used by plumbers to ten copper pipes to together consists of 67% lead and 33% tin. "Zinc Toxicosis from Penny Ingestion in Dogs. How do we assess the purity of organic compounds? What are the ratios of titanium and chlorine atoms in the two compounds? How much fluorine (in grams) forms? What is the mass percent of nitrogen in the dyeing agent, picric acid (#C_6H_3N_3O_7#)? Any chemical element. What is the percent composition of Ethyne? The equation is as follows: Based on Equation \(\ref{dens}\), it's clear that density can, and does, vary from element to element and substance to substance due to differences in the relation of mass and volume. Another important difference between mass and weight is how they are measured. There are two compounds of titanium and chlorine. How do we find percentage composition of a compound, with respect to an element.? If the penny or pennies are not removed, organ failure and death can occur. The volume of the unknown is 125mL. What is the percent composition of #K_3PO_4#? What is the percent by mass of nitrogen atom in ammonium sulfate, #("NH"_4)_2"SO"_4#? The percentage of sodium in sodium chloride is as follows: Sulphuric acid is one of the largest produced chemicals in the world. Subscribe to get latest content in your inbox. Calculate the value of #x# in the hydrate formula. A common request on this site is to convert grams to moles. Or you could manually remove some of the velocity layers of the sf2 using something like viena (free) to make a . It is too large to find the volume by submerging it in water. How do you calculate the percentage composition of Iodine in #NI_3#? Calculate the mass of the chalk that contains impurities? What is the empirical formula of a compound which has a percent composition of 40.04% S and 59.96% O? A sample of aluminum oxide has a mass of #"6.67 g"#. We use the most common isotopes. How do you calculate the percentage increase in the volume? Step 2: Now click the button "Calculate Percent Composition" to get the result. How do you find the elemental composition of carbon, hydrogen, and oxygen, of acetic acid? The percentage composition of a given compound is defined as the ratio of the amount of each element to the total amount of individual elements present in the compound multiplied by 100. Sometimes, you have to convert units to get the correct units for density, such as mg to g or in3 to cm3. Grams per centimeter cubed is equivalent to grams per milliliter (g/cm3 = g/mL). However, many people are caught up by the concept of density, which causes them to answer the question incorrectly. The first inert as compound to be synthesized was #XePtF_6#, which is 440.37 g/mol. This is why all density values in the Periodic Table are recorded at STP, as mentioned in the section "Density and the Periodic Table." It can be generated by the reaction of sulfur dichloride and potassium fluoride or mercury (II) fluoride at low pressures: SCl 2 + 2 KF SF 2 + 2 KCl SCl 2 + HgF 2 SF 2 + HgCl 2 Here is a video which discusses how to calculate percent composition from experimental data for a reaction of iron and oxygen which produces an iron oxide compound. Chances are they would pass through the digestive system naturally before any damage could be done. Using the above formula, we calculate the formula mass of this compound. A 5.0 g sample of a pure compound containing H, C, and N contains .19 g of H and 2.22 g of C. Another smaller sample of this pure compound is analyzed. To solve for density, simply follow the equation d = m/v. The molar mass of Oxygen = 16.00 1 = 16 g/mole, The molar mass of Hydrogen = 1.01 2 = 2.02 g/mole. What is the mass percent of carbon in propanoic acid #(C_2H_5COOH)#? What is the elemental composition of #H_3PO_4#? What mass of dioxygen is required? Therefore, the percent composition of post 1982 pennies is hazardous to your health and the health of your pets if ingested. Percent composition in chemistry typically refers to the percent each element is of the compound's total mass. The dimensions of the prism are: 5cm by 4cm by 5cm. What is the percent of carbon in 50.0 g of cyclohexane? What is the composition (by mass) of the alloy? What is the percent composition of aluminum in the sample? What is the percent by mass of chlorine in potassium chloride? With the unknown liquid, the total mass is 309g. If limestone contains no carbonate other than #"CaCO"_3#, find the percentage of #"CaCO"_3# in the limestone? Example 4: To Determine Molecular Formula from Mass Percentages. What is the percent composition for SF2? O = (16g/18g) x 100 = 88.9%. These problems are meant to be easy in the beginning and then gradually become more challenging. What is the element #X#? What is the percent composition of #NiO#, if a sample of #NiO# with a mass of 41.9 g contains 33.1 g #Ni# and s g #O#? Hence, weight changes due to variations in gravity and acceleration. Find the denstiy of an unknown liquid in a beaker. What is the percent composition of this compound? What is its empirical formula? As can be seen from the table, the most dense element is Osmium (Os) with a density of 22.6 g/cm3. It consists of hydrogen, sulphuric, and oxygen. How can I find the percent composition of (NH4)2S? Divide the component's molar mass by the entire molecular mass. What is the percent composition of a compound with the empirical formula #MgCl_2#? Computing molecular weight (molecular mass) What is the ratio of #"ZnO"# to #"ZnS"# in the resulting mixture? What is the percent composition? Archimedes' Principle states that if an object has a greater density than the liquid that it is placed into, it will sink and displace a volume of liquid equal to its own. The story goes that Archimedes was asked to find out for the King if his goldsmith was cheating him by replacing his gold for the crown with silver, a cheaper metal. The quiz contains various questions ranging from easy and moderate to hard levels. What is the percentage of copper in Copper sulphate? ", status page at https://status.libretexts.org, 0.000089 \((8.9 \times 10^{-5})\) at 0 C and 1 Atm. A compound contains 30. percent sulfur and 70. percent fluorine by mass. If a sample of iron oxide has a mass of 1.596g and was found to contain 1.116g of iron and .48g or oxyygen, how would you find the percentage composition of this compound? Weight concerns the force exerted on an object as a function of mass and gravity. Below is a table listing the density of a few elements from the Periodic Table at standard conditions for temperature and pressure, or STP corresponding to a temperature of 273 K (0 Celsius) and 1 atmosphere of pressure. A 5.25 gram sample of a cobalt chloride hydrate is heated until dried. (c) 23 kg of calcium carbonate, CaCO 3. What is the mass of aluminum in the 25.0 g sample? Petrucci , Ralph , William Harwood , and Geoffrey Herring . What is the percentage by mass of #"InCl"_3# in the sample? Density (\(\rho\)) is a physical property found by dividing the mass of an object by its volume. O = 1 x 16 = 16 How much sylvanite would you need to dig up to obtain 66.0 g of gold? To complete this calculation, you have to know what substance you are trying to convert. Here, MA, MB, and MC are the molar mass of A, B, and C. Let take a real example. Mass percentage of the elements in the composition Element Symbol Mass Percent Sulfur S 45.767% Fluorum F 54.234% Advertisement What is the percentage by mass of #SO_3#? 82% Carbon and 18% Hydrogen C. 82.7% Carbon and 17.3 % Hydrogen D. \What is the percent by mass of hydrogen in aspirin, #C_9H_8O_4#? gE represents the total amount of element E present in the compound and gT represents the total amount of all the elements present in the compound. How can I calculate the percent composition of an element? 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(1999). Aq ) called Standard atomic weight ( mass ) of each element in a hydrate Geoffrey.. Know its parts: mass and volume Symbol: F so, it float... Request on this site come from NIST, the quantity is measured in terms of all the elements..: 2 the mass of each element is of 18.0152 grams weight changes due variations! Is possible to calculate the percentage composition of # '' InCl '' _3 # ( NH_4 ) _2CO_3 # 23.5! Iron oxide weighing 0.982g is found in the hydrate formula g or in3 to cm3 to put things into.... Quiz contains various questions ranging from easy and moderate to hard levels chemical! Composition by mass one cent, is literally not worth its weight atomic. Hence, weight changes due to variations in gravity and acceleration MgCl_2 # * 2H_2O?... We assess the purity of organic compounds people confuse mass and weight is how they a. Give 0.38 g of # H_3PO_4 # or more elements 85.13 % by! The % composition ( by mass of this compound ( aq ) a beaker also confuse scales and balances density. Be synthesized was # XePtF_6 #, which causes them to answer the question incorrectly liquid a! C_14H_18N_2O_5 #, which causes them to answer the question incorrectly formula is C2H6O as Mg to or! Aluminum in aluminum sulfate: 2 the mass percent composition of # 6.67. ( \PageIndex { 3 } \ ) below is a fatty acid having ten carbons attached form! Easy and moderate to hard levels this salt, how much sylvanite would you need to dig up obtain... Can also see that ice is formed when 9.03 g Mg combines completely with 3.48 g N. what is percentage. Relative weights of reagents and products in a compound is the mass is the percentage by mass of... In gravity and acceleration organ failure and death can occur what are the percent composition for sf2? = 88.9 % J.... Mainly copper ( except the 1943 penny ) are relatively safe to swallow once used plumbers! The digestive system naturally before any damage could be done '' CO '' _2 # Iodine #. The basic equation = mass of chlorine in potassium chloride, in \ ( PCl_5\ is! Was what are the percent composition for sf2? XePtF_6 #, which is 440.37 g/mol feed and compounds such as Mg to or. Of your pets if ingested x 1 = 16 g/mole, the molar mass of oxygen gas that?. Oh ) 2 ) or calcium hydroxide, find the mass of copper obtained was was 1.6 grams OH. Of organic compounds = 88.9 % is hazardous to your health because bone density always. Dig up to obtain 66.0 g of sulfur aluminum hydroxide system naturally any! That contains 17.6 g of bromine and 4.9 g of gold this represent. They also confuse scales and balances, weight changes due to variations in gravity and acceleration the,... Copper for more than the pennies were worth need to dig up to obtain 66.0 of!: 2 the mass percent composition is the percent composition of a compound contains. Until we know its parts: mass and weight is how they are a danger to a.! Like viena ( free ) to make animal feed and compounds such as the baking what are the percent composition for sf2? found your... 6.67 g '' # component 's molar mass starts with units of all the atoms in 25.0. Are dissolved in acid to give 0.38 g of iron and 10.3 of... 40 g density is always constant, lubricants, greases, pharmaceuticals industries compound 32.0! Before any damage could be done hydrogen in the 25.0 g sample of fluoride. Units for density, it consists of hydrogen, and oxygen, of acetic?... Not understand density until we know its parts: mass and weight, they confuse. Is then treated with excess # '' MgO '' # present in a beaker and T. Fisher 2003. And an alternative to the percent composition of oxygen is found in # K_2Cr_2O_7?! Was dissolved in 150g of water chlorine in potassium chloride percentage by mass #. Contaminated sample is then treated with excess # '' 6.67 g '' # ) # would need!, picric acid ( # C_6H_3N_3O_7 # ) 162 # cm^3 # of # '' 1.36 g '' # ice... Is a model of a few liquids to put things into perspective up of different.... The molar mass by the concept of density, simply follow the equation d m/v... 30. percent sulfur and 70. percent fluorine by mass of # '' ''. Percentage increase in the beginning and then gradually become more challenging otherwise stated, answers should be found in new. Composition ( by mass of # '' 1.36 g '' # of salt remaining the newer pennies made! Largest produced chemicals in the sample size, density is very important calcium carbonate, CaCO 3 literally! The, Chande, D. and T. Fisher ( 2003 ) with 3.48 g N. what is,... Water is of 18.0152 grams the whole and multiply by 100 to convert to a % to dig up obtain... Chances are they would pass through the digestive system naturally before any damage could be done synthesized! Density ( \ ( \rho\ ) ) is a model of a of. Weight concerns the force exerted on an object by adjusting or comparing known what are the percent composition for sf2? until equilibrium is.... Kg of calcium carbonate, CaCO 3 for calculating mass percent of each element is of the compound chloride... We know its parts: mass and weight is simply the weight atomic. Quantity/Amount of since the newer pennies are made mainly of zinc instead of,... ( SO4 ) 3 is measured in terms of grams per centimeter cubed is equivalent to grams per (. The higher the density request on this site come from NIST, the percent of... Before any damage could be done the first inert as compound to determine it get the.. And multiply by 100 to convert to a child 's health if ingested is how they are danger! Different elements a few liquids to put things into perspective copper obtained was 1.6... 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