What mass of hydrogen is formed during the decomposition of 72 g water by electric current?
| September 30, 2021 | education
1. Let’s write down the reaction equation:
2H2O = 2H2 + O2.
2. Find the amount of water:
n (H2O) = m (H2O) / M (H2O) = 72 g / 18 g / mol = 4 mol.
3. Using the reaction equation, we find the amount and then the mass of hydrogen:
n (H2) = n (H2O) = 4 mol.
m (H2) = n (H2) * M (H2) = 4 mol * 2 g / mol = 8 g.
Answer: m (H2) = 8 g.
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