Question

A 36 g sample of water is decomposed in an electrolysis reaction giving hydrogen and oxygen. How many grams of hydrogen are produced??

Answer 1

Answer on Question #48937, Chemistry, Other

**Task:**

A 36 g sample of water is decomposed in an electrolysis reaction giving hydrogen and oxygen. How many grams of hydrogen are produced?

**Answer:**

$$2 \mathrm{H_2O} \rightarrow 2 \mathrm{H_2} + \mathrm{O_2}$$ $$\nu = \frac{m}{M}$$ $$M (H_2O) = 18 \, \text{g/mol}$$ $$\nu (H_2O) = \frac{36}{18} = 2 \, \text{mol}$$ $$\nu (H_2) = 2\nu (H_2O) = 2 \cdot 2 = 4 \, \text{mol}$$ $$M (H_2) = 2 \, \text{g/mol}$$ $$m (H_2) = \nu (H_2) \cdot M (H_2) = 4 \cdot 2 = 8 \, \text{g}$$

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