Solving Stoichiometry Problems
True, False
_____ 1. A major types of stoichiometry problem is a mass-mass problem.
_____ 2. In a mass-mass problem, the coefficients in the balanced equation represent the numbers of moles of reactants and products.
_____ 3. In solving a mass-mass problem, it is necesary to convert the given mass to moles.
_____ 4. The molar volume of any gas at STP is 24.2 L.
_____ 5. When the mass of a reactant is given, the number of moles can be found by dividing the mass by the reactant's molar mass.
_____ 6. The coefficients in a chemical equation also represent the ratio of the mass of gases involved in the reaction.
Write the balanced equations for each of the following problems. Then solve the problems as directed. Show all your work.
7. When 9.8 g of aluminum oxide (Al2O3) decomposes, how many grams of aluminum metal are produced?
8. How many grams of iodine are produced when 0.72 mol of fluorine react with potassium iodide (KI)?
9. How many grams of sodium are required to react with water to produce 5.0 g of sodium hydroxide? How many grams of H2 are produced? What volume would be occupied by the resulting hydrogen at STP?
10. 20.0 g of potassium react with water to produce potassium hydroxide and hydrogen gas. How many liters would the hydrogen gas occupy at STP?
11. If 30.2 g of aluminum react with HCl to produce aluminum chloride and hydrogen gas, how many liters of hydrogen are produced at STP?
12. How many liters of HCl are produced by the reaction of 5.7 L of hydrogen with an equal amount of chlorine?
13. How many liters of hydrogen are required to react with 0.45 mol of oxygen to produce water?
14. How many liters of SO2 are produced from the reaction of sulfur with 26.9 L of oxygen.
15. How many grams of zinc chloride will be produced if zinc is allowed to react with 16.8 L of chlorine at STP?