MCQ
The molarity of $\mathrm{HNO}_{3}$ in a sample which has density $1.4 \;\mathrm{g} / \mathrm{mL}$ and mass percentage of $63 \%$ is ______ $\mathrm{M}$ થશે.
(Molecular Weight of $\mathrm{HNO}_{3}=63$ )
- A$22$
- B$19$
- C$17$
- ✓$14$
✓
Answer
Correct option: D.
$14$
d
$100\, \mathrm{gm}$ soln $\rightarrow 63\, \mathrm{gm} \mathrm{HNO}_{3}$
$100\, \mathrm{gm}$ soln $\rightarrow 63\, \mathrm{gm} \mathrm{HNO}_{3}$
$\frac{100}{1.4} \mathrm{mL} \rightarrow 1$ mole $\mathrm{HNO}_{3}$
Molarity $=\frac{1}{\frac{100}{1.4} \times \frac{1}{1000}}=14 \;\mathrm{M}$
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