Chemistryhard · Past Paper
How many grams of Magnesium are required to produce 40g of Magnesium Oxide ($MgO$)? (Mg=24, O=16)
A24g
B12g
C48g
D20g
✓ Correct Answer: A — 24g
Equation: $2Mg + O_2 \rightarrow 2MgO$. 48g Mg gives 80g MgO. Therefore, 24g Mg gives 40g MgO.
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