MCQ
Number of hydrogen atoms per molecule of a hydrocarbon A having $85.8 \%$ carbon is $...............$.(Given : Molar mass of $A =84\,g\,mol ^{-1}$ )
- A$13$
- B$14$
- C$15$
- ✓$12$
✓
Answer
Correct option: D.
$12$
d
| Element | Percentage | Mole | Mole ratio |
| $C$ | $85.8$ | $\frac{85.8}{12}=7.15$ | $1$ |
| $H$ | $14.2$ | $\frac{14.2}{1}=14.2$ | $2$ |
Empirical formula $\left( CH _2\right)$
$14 \times n=84$
$n =6$
$\therefore$ Molecular formula $C _6 H _{12}$
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