Calculate the mass and amount of magnesium that burned in 33.6 l oxygen

univerkov | July 25, 2021 | education

Given:
V (O2) = 33.6 l

To find:
m (Mg) -?
n (Mg) -?

1) 2Mg + O2 => 2MgO;
2) n (O2) = V / Vm = 33.6 / 22.4 = 1.5 mol;
3) n (Mg) = n (O2) * 2 = 1.5 * 2 = 3 mol;
4) m (Mg) = n * M = 3 * 24 = 72 g.

Answer: The mass of Mg is 72 g; the amount of substance is 3 mol.

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