Question

$1.2\mathrm{g}$ of Mg (at. mass 24) will produce MgO equal to

• A. $0.05\mathrm{mol}$
• B. $40\mathrm{g}$
• C. $40\mathrm{mg}$
• D. $4\mathrm{g}$

Hint:

In a reaction, moles of product are proportional to moles of limiting reactant.

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
$2\mathrm{Mg} + \mathrm{O_2} \rightarrow 2\mathrm{MgO}$.
Step 2: Detailed Explanation:
Moles of Mg = $\frac{1.2}{24} = 0.05$ mol. Moles of MgO produced = 0.05 mol. Mass = $0.05 \times 40 = 2$ g. Option (A) $0.05$ mol is correct.
Step 3: Final Answer:
$0.05$ mol of MgO is produced.