1. We make a chemical equation, not forgetting to put down the coefficients:
2H2 + O2 = 2H2O.
2. Find the amount of substance oxygen:
n (O2) = 160/32 = 5 mol.
3. The amount of oxygen is equal to the amount of water:
n (О2) = n (H2O).
4. Find the mass of water:
m (H2O) = M * n = 18 * 5 = 90g.
Answer: m (H2O) = 90g.
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