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Stoichiometry: Mass-Mass and Mass-volume Problems
Show all work in dimensional analysis and include correct units.
1. 2KClO3 → 2KCl + 3O2
How many grams of Oxygen gas, O2, are produced if 25.0g of potassium chlorate, KClO3,
decompose?
2. N2 + 3H2 → 2NH3
How many grams of hydrogen, H2, are necessary to react completely with
25.0 g of nitrogen, N2?
3. How many grams of ammonia, NH3, are produced in the reaction with
50.0 g of H2, Hydrogen, in Problem 2?
4. 2AgNO3 + BaCl2 → 2AgCl + Ba(NO3) 2
How many grams of AgCl, silver chloride, are produced from 15.0 g of AgNO3, silver
nitrate?
5. How many grams of BaCl2, barium chloride, is necessary to react with the
18.0 g AgNO3, silver nitrate, in Problem 4?
6. Calculate the volume of oxygen produced at STP by the decomposition of 10.0 g of
potassium chlorate KClO3:
2KClO3
2KCl + 3O2
7. If excess chlorine gas reacts with a solution containing 20.0 g of potassium bromide, how
many milliliters of bromine gas can be produced:
2KBr + Cl2
2KCl + Br2
8. Calculate the volume of oxygen gas that can be produced by the electrolysis of 5.00 g of
water:
2H2O
2H2 + O2