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Stoichiometry – The Mole Study Guide
Grams and Moles Review (3 points each)
Calculate the Molar Mass of each element or compound
1) Sn Tin! 118.71 g/mole
2) Fe2O3 159.69 g/mole
3) H2SO4 98.1 g/mole
Calculate the mass in grams
4) 8 moles of NH3 8 x 17.031 = 136.35 g
5) 10 moles of AgNO3 10 mol x 169.874 g/mol = 1698.7 g
Calculate the amount in moles
6) 80.1 grams of Ca 80.1 g Ca ÷ 40.078 g/mol = 1.998 = 2.00 moles
7) 48.4 grams of Cu(NO3)2.3H2O 48.4 g ÷ 241.6 g/mol = 0.200 moles
Find molar mass! 1 x Cu, 2 x N, 6 x H, 6 + 3 = 9 O. MM = 241.6 g/mol
Mole-Mole Stoichiometry
Given the reaction 4 Fe + 3 O2 2 Fe2O3
8) Given 64 moles of Fe and excess O2, how many moles of Fe2O3 can be made?
64 mol Fe x 2 mol Fe2O3 = 128/4 = 32 mol Fe2O3
4 mol Fe
9) Given 48 moles of O2 and excess Fe, how many moles of Fe2O3 can be made?
48 mol O2 x 2 mol Fe2O3 = 32 mol Fe2O3
3 mol O2
10) To make 4 moles of Fe2O3, how many moles of Fe are necessary? How many moles of O2?
4 mol Fe2O3 x 4 mol Fe = 8 mol Fe
2 mol Fe2O3
4 mol Fe2O3 x 3 mol O2 = 6 mol O2
2 mol Fe2O3
