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How many liters of water can be made from 34 grams of oxygen gas and 6 grams of hydrogen gas at STP?
Your second problem is a two-parter. First to determine which is the limiting reagent, figure how many grams of H2 would be needed to mix with 34 g O2:
34 O2 x mol O2/32 g O2 x 2 mol H2/mol O2 x 2 g H2/mol H2 = 4.25 g H2
Since you have 6 grams H2, the O2 is the limiting reagent and will be used to calculate how much water will be made:
34 g O2 x mol O2/32 g O2 x 2 mol H2O/mol O2 x 18 g H2O/mol H2O x 1 mL H2O/1 g H2O x L/1000 mL = 0.038 L H2O
Write these problems out and follow them step by step. Dimensional analysis is a very useful method to simply do complex conversions. You can learn a lot by making sure you understand why each term is there.
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