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Please help..

1. How much water could you get if you started with 250.0 grams of hydrogen?

2. How much water could you get if you started with 250.0 grams of oxygen?

3. How much propane would you need to produce 1000.0 grams of water?

4. How much of each reactant is needed to produce 150 grams of hydrogen gas?

2 answers

2H2 + O2 ---> 2H2O
You get 1 mol water for each 1 mol of H2
H2O is 2+16 = 18 grams / mol
H2 is 2 grams / mol so 250 grams = 125 mol
125 mol * 18 grams/mol = 2250 grams of H2O
Now you try.