MCQ
Complete combustion of $0.858\;g$ of compound $X$ gives $2.63\;g$ of $C{O_2}$ and $1.28\;g$ of ${H_2}O$. The lowest molecular mass $X$ can have ............ $\mathrm{g}$
- ✓$43$
- B$86$
- C$129$
- D$172$
✓
Answer
Correct option: A.
$43$
a
(a) $\% \,C = \frac{{12}}{{44}} \times \frac{{{W_{C{O_2}}}}}{W} \times 100$
(a) $\% \,C = \frac{{12}}{{44}} \times \frac{{{W_{C{O_2}}}}}{W} \times 100$
$ = \frac{{12}}{{44}} \times \frac{{2.63}}{{0.858}} \times 100 = 83.6\% $
$\% \,H = \frac{2}{{18}} \times \frac{{{W_{{H_2}O}}}}{W} \times 100$
$ = \frac{2}{{18}} \times \frac{{1.28}}{{.858}} \times 100 = 16.4\% $
|
Element |
$\%(a)$ |
At.wt.$(b)$ |
$a/b$ |
Ratio |
|---|---|---|---|---|
|
$C$ |
$83.6$ |
$12$ |
$6.96$ |
$1$ |
|
$H$ |
$16.4$ |
$1$ |
$16.4$ |
$2.3$ |
${C_3}{H_7} = 12 \times 3 + 7 = 43\,gm$
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