(5 points) how many moles of oxygen are necessary to completely react with propane
(c3h8) to produce 16.3 mol of water according to the following balanced chemical
equation?
c3h8 + 5 o2  3 co2 + 4 h2o
7. (10 points) what mass of barium hydroxide is necessary to react with 253 g of
phosphoric acid (h3po4) according to the following balanced chemical equation?

2 h3po4 + 3 ba(oh)2  ba3(po4)2 + 6 h2o
8. (5 points) what volume of carbon dioxide (co2) gets produced when 8.0 l of octane
(c8h18) react with excess oxygen according to the following balanced chemical
equation?
2 c8h18 + 25 o2  16 co2 + 18 h2o