Calculate the mass of hydrogen released when interacting with water 20 g of calcium.

univerkov | February 7, 2021 | education

Given:
m (Ca) = 20 g

To find:
m (H2) -?

Decision:
1) Ca + 2H2O => Ca (OH) 2 + H2 ↑;
2) n (Ca) = m (Ca) / M (Ca) = 20/40 = 0.5 mol;
3) n (H2) = n (Ca) = 0.5 mol;
4) m (H2) = n (H2) * M (H2) = 0.5 * 2 = 1 g.

Answer: H2 mass is 1 g.

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