MCQ
A $1000\, gm$ sample of $NaOH$ contains $3\, moles$ of $O\, atoms$. What is the $\%$ purity of $NaOH$ .............. $\%$
- A$14$
- B$100$
- ✓$12$
- D$24$
✓
Answer
Correct option: C.
$12$
c
$\quad n_{\mathrm{NaOH}}=n_{\mathrm{O}}$
$\quad n_{\mathrm{NaOH}}=n_{\mathrm{O}}$
$\therefore m_{\mathrm{NaOH}}=40 \times 3=120 \mathrm{g}$
$\therefore \quad \%$ purity $=\frac{120}{1000} \times 100=12 \%$
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