20. 4 grams of He gas * 20 grams of Ne gas * 32 grams of O 2 gas * 46 grams of CO 2 gas * 1 mol of He gas * 1 mol of Ne gas * 1 mol of O 2 gas * 1mol of CO 2 gas *
21. What volume will 0.78 mol of H 2 occupy at STP? 0.78 mol H 2 x 1 1 mole 22.4 L = 17.47 L
22. A gaseous compound composed of oxygen has has a density of 2.14 g/L @ STP, what is the molar mass of the gas? 2.14 g L x 22.4 L mole = 47.9 g / mole
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25. Empirical Formula Example Cont. 1.85 mol N 4.63 mol O / 1.85 / 1.85 = = 1.00 2.50 x x 2 2 N 2 O 5 = = 2 5