For every gas at STP 1 mole occupies 22.4 L.

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For every gas at STP 1 mole occupies 22.4 L. Bellringer 5/2 For every gas at STP 1 mole occupies 22.4 L. How many L would the following contain? 3.20 moles of O2? 0.50 moles of NH3? 6.70 moles of C3H8? 2. When 2.0L of propane gas (C3H8) is combusted to form water vapor and carbon dioxide at a temperature of 250C and a pressure of .850 atm, what mass of water vapor will result? Hint: use ideal gas law to find moles of propane gas; then do a mole to gram stoichiometry problem from propane to water Answers: 1. 71.68 L; 11.2 L; 150. L 2. 2.9 g water vapor