MCQ
$1.5$ mol of ${O_2}$ combine with $Mg$ to form oxide $MgO$. The mass of $Mg$ (at. mass $24$) that has combined is .............$\mathrm{g}$
- ✓$72$
- B$36$
- C$48$
- D$24$
✓
Answer
Correct option: A.
$72$
a
(a) $\mathop {Mg}\limits_{1{\rm{mole}}} + \mathop {\frac{1}{2}{O_2}}\limits_{0.5{\rm{mole}}} \to MgO$
(a) $\mathop {Mg}\limits_{1{\rm{mole}}} + \mathop {\frac{1}{2}{O_2}}\limits_{0.5{\rm{mole}}} \to MgO$
$0.5$ mole of oxygen react with $1$ mole of $Mg$
$1.5$ mole of oxygen react with $\frac{{1.5}}{{0.5}} = 3$
mole $24 \times 3 = 72\,gm$.
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