Calcium with a mass of 2 g reacted with oxygen. how much oxygen will react?

univerkov | September 2, 2021 | education

Given:
m (Ca) = 2 g

Find:
V (O2) -?

Solution:
1) 2Ca + O2 => 2CaO;
2) n (Ca) = m (Ca) / M (Ca) = 2/40 = 0.05 mol;
3) n (O2) = n (Ca) / 2 = 0.05 / 2 = 0.03 mol;
4) V (O2) = n (O2) * Vm = 0.03 * 22.4 = 0.7 liters.

Answer: The O2 volume is 0.7 liters.

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