19-20. KO2 is used in a closed-system breathing apparatus. It removes carbon dioxide and water from exhaled air. The reaction for the removal of water is: KO2 + H2O O2 + KOH. The KOH produced is used to remove carbon dioxide by the following reaction: KOH + CO2 KHCO3.

a. What mass of KO2 produces 5000 g of O2?

b. What mass of CO2 can be removed by 1000 g of KO2?

The equation below shows a chemical reaction. a + b + heat —> c + d according to the law of conservation of energy, which statement is true? a. the reactants absorb heat because they have less energy than the products. b. the products release heat because they have more energy than the reactants. c. the reactants generate heat because they have more energy than the products. d. the products require heat to form because they have less energy than the reactants.