1. We make a chemical equation, not forgetting to put down the coefficients:
Ca + 2HCl = CACl2 + H2.
2. Let’s find the amount of calcium substance:
n (Ca) = m / M = 16/40 = 0.4 mol.
3. From the equation you can see:
n (Ca) = n (H2) = 0.4 mol.
4. Let’s find the volume of hydrogen:
V (H2) = n * Vm = 0.4 * 22.4 = 8.96 liters.
Answer: V (H2) = 8.96 liters.
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