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Math of Chemistry Review Sheet Solve the following. Show all work, round all atomic masses to the nearest whole number What is the gram formula mass of (NH4)2SO3 Ca(OH)2 K2CrO7 Calculate the number of moles in Calculate the mass of 25grams of Pb(NO3)2 127grams of HgI 3grams of KMnO4 7.5moles of H2SO4 12moles of NaOH 5.5moles of NaHCO3 What is the percent composition of Nitrogen in NH3 Carbon in CO2 Water in MgSO4·7H2O Water in CuCl2·2H2O Calculate the percentage composition of water in the following hydrates if: A 12gram Hydrate in heated to a constant mass of 6grams A 16gram Hydrate is heated to a constant mass of 12grams A 15gram Hydrate is heated to a constant mass of 10grams What is the molecular formula if The formula mass is 80 and the empirical formula is CH4 The formula mass is 34 and the empirical formula is HO The formula mass is 78 and the empirical formula is CH How many significant figures are there in the following numbers 0.0000754 000.105 107.000 25.0005 N2 + 3H2 → 2NH3 How many moles of ammonia will be produced if 12 moles of Hydrogen are consumed 4Fe + 3O2 2Fe2O3 How many moles of iron will be used if 5 moles of iron(III)oxide are produced. C6H12O6 + 9O2 6CO2 + 6H2O How many moles of water will be produced if 4 moles of C6H12O6 are consumed What is the percent error if the accepted value is 5.4 and the experimental value is 6.2 What is the percent error if the accepted value is 10 and the experimental value is 9.5 What is the percent error if the accepted value is .25 and the experimental value is 0.2 What is the density of the following. Give your answer in correct number of significant figures A cube with a volume of 5.0cm3 and a mass of 25.00grams A block with a volume of 36.00cm3 and a mass of 114.0grams A rock with a volume of 16.00cm3 and a mass of 96.00grams