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How many grams of magnesium oxide is formed when 4.8 gm of magnesium is combined with \( 3.2 \mathrm{gm} \) of oxygen?

1. \( 4.2 \mathrm{gm} \)
2. 3.2 gm
3. 8 gm
4. \( 16 \mathrm{gm} \)

Correct answer: \( 4.2 \mathrm{gm} \)

Solution

Magnesium and oxygen combine in a fixed 2:1 mole ratio to form MgO. Oxygen is the limiting reactant here, so it determines how much product can form, giving 4.2 g of magnesium oxide.

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