3.1 Chemical Measurements Questions
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The equation for the reaction of copper carbonate and sulfuric acid is: CuCO3 + H2SO4 → CuSO4 + H2O + CO2 Relative formula masses : CuCO3 = 123.5; H2SO4 = 98.0; CuSO4 = 159.5 Calculate the percentage atom economy for making copper sulphate from copper carbonate.
123.5 + 98.0 = 221.5 for the reactants CuSO4=159,5 159.5/221.5 x 100 = 72.009 72.0% So, I am calculating the total formula mass of the reactants But I only care about the product, so I only look at the products formula mass So I divide the formula mass of the product I want by the total of the reactants
Carbon can react with oxygen to produce carbon monoxide (CO). 1) Calculate the relative formula mass of CO Relative atomic masses C = 12; O = 16 2)Calculate the percentage by mass of carbon in carbon monoxide.
1) CO is one atom of oxygen and one atom of carbon, therefore 12+16=28 2) Mass of carbon in carbon monoxide, so we know the total mass is 28 Carbon has a mass of 12 12/28= 42.85 42.9%
Relative atomic masses Cl = 35.5 Fe = 56. 1) Calculate the relative formula mass of iron chloride (FeCl3) 2) Calculate the percentage of iron in iron chloride
1) FeCl3 = one atom of iron and three atoms of chlorine 1x56 + 3(35.5)= 162.5 2) Iron = 56 56/162.5 x 100 = 34.46 34.46%