MCQ
The weight of $1 \times {10^{22}}$molecules of $CuS{O_4}.5{H_2}O$ is ........... $\mathrm{g}$
- A$41.59$
- B$415.9$
- ✓$4.159$
- DNone of these
✓
Answer
Correct option: C.
$4.159$
c
(c) [ Molecular weight of $CuS{O_4}.5{H_2}O$ $ = 63.5 + 32 + 64 + 90$$ = 249.5$]
(c) [ Molecular weight of $CuS{O_4}.5{H_2}O$ $ = 63.5 + 32 + 64 + 90$$ = 249.5$]
$6 \times {10^{23}}$molecules has weight $ = 249.5\,gm$
$1 \times {10^{22}}$ molecules has weight $ = \frac{{249.5 \times 1 \times {{10}^{22}}}}{{6 \times {{10}^{23}}}}$
$ = 41.58 \times {10^{ - 1}}$ $ = 4.158$
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