MCQ
An element $X$ reacts with oxygen to form a compound $X_2O_3$. If the atomic mass of $X$ is $91.5$ the equivalent mass of $X$ is
- ✓$30.5$
- B$45.75$
- C$61$
- D$91.5$
✓
Answer
Correct option: A.
$30.5$
a
In compound $\mathrm{X}_{2} \mathrm{O}_{3}$
In compound $\mathrm{X}_{2} \mathrm{O}_{3}$
$\because 3 \times 16\, g$ of $O$ is combined with $\rightarrow$
$2 \times 91.5 \,\mathrm{g} \text { of } \mathrm{X}$
$8\, \mathrm{g}$ of $\mathrm{O}$ is combined with $\rightarrow \frac{2 \times 91.5}{3 \times 16} \times 8$
$=30.5\, \mathrm{g} \text { of } \mathrm{X}$
so equivalent weight of $X=30.5$
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