Magnesium and oxygen combine in the ratio of 3 : 2 by mass to form magnesium oxide. What mass of oxygen gas would be required to react completely with 24 g of magnesium?

Magnesium reacts with oxygen in the ratio of 3:2 to form magnesium oxide.
Hence, 3g of magnesium react with 2g of oxygen to form magnesium oxide.
1g of magnesium requires = 2/3g of oxygen = 0.66g of oxygen
24g of magnesium require = 24 × 0.66g of oxygen = 16g
16g of oxygen would be required to react completely with 24g of magnesium.

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Updated on: 10-Oct-2022

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