What mass of water is formed if 160 grams of oxygen reacted with hydrogen?

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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