1) Cl2 + 2KBr → 2KCl + Br2, calculate the percent yield if 200. g of Cl2 react with excess KBr to produce 410. g of Br2. 2) Find the number of moles in 508 g of ethanol (C2H6O). 3) How many moles is 1.50x1023 molecules of NH3? 4) How many moles of C6H12O6 can be “burned” when 10.0 mol of O2 is consumed? C6H12O6+6O2→6CO2+6H2O 5) What is the number of moles in 432 g barium nitrate? 6) How many grams are in 5.66 mol of CaCO3? 7) How many hydrogen atoms are in 5 molecules of isopropyl alcohol, C3H7O? 8) What is the molar mass of (NH4)2CO3? 9) How many moles of silver atoms are in 1.8 x 1020 atoms of silver? 10) The volume of one mole of a gas at STP is ____. 11) What is the volume of 70.0 g of fluorine gas at STP? 12) Given the balanced equation repre4 Fe + 3 O2→ 2 Fe2O3 What is the mole ratio of Fe to Fe2O3? 13) A mass of 5.4 grams of Al reacts with CuCl2. What mass of Cu is produced? 3 CuCl2 + 2 Al → 2 AlCl3 + 3 Cu 14) CaCO3 --> CaO + CO2 If 2.75 moles of CaCO3 is decomposed, the mass of CO2 formed will be 15) 2 CO(g) + O2 (g) → 2 CO2(g) What is the mole ratio of CO (g) to CO2(g) in this reaction?

Moles and Stoichiometry Review

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