Determine the amount of substance (mol) of oxygen that will be required to burn 12 g of magnesium.

univerkov | August 3, 2021 | education

Given:
m (Mg) = 12 g

To find:
n (O2) -?

Solution:
1) O2 + 2Mg => 2MgO;
2) n (Mg) = m / M = 12/24 = 0.5 mol;
3) n (O2) = n (Mg) / 2 = 0.5 / 2 = 0.25 mol.

Answer: The amount of substance O2 is 0.25 mol.

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