How much water, in grams, can be made from

Question

6.82 × 1024 hydrogen molecules?
Answer in units of g

Answer 1

2H2 + O2 ==> 2H2O

6.82E24 H2 molecules x (1 mol/6.02E23) = ? mols H2.
1 mol H2 makes 1 mol H2O which weighs 18 grams.