Chemistry · Chemical equations and stoichiometry
How many grams of magnesium oxide is formed when 4.8 gm of magnesium is combined
How many grams of magnesium oxide is formed when 4.8 gm of magnesium is combined with \( 3.2 \mathrm{gm} \) of oxygen?
- A. \( 4.2 \mathrm{gm} \)
- B. 3.2 gm
- C. 8 gm
- D. \( 16 \mathrm{gm} \)
Step-by-step solution
Balanced equation: 2Mg + O2 → 2MgO. Moles Mg = 4.8 g / 24 g/mol = 0.2 mol; moles O2 = 3.2 g / 32 g/mol = 0.1 mol. Stoichiometric ratio 2:1 matches, so both are fully consumed. Moles MgO = moles Mg = 0.2 mol. Mass MgO = 0.2 mol × 40 g/mol = 8 g.
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