MCQ
Consider a reaction $2H_2O_{(l)} \to 2H_{2(g)} + O_{2(g)}$ Calculate the work done at $25\,^oC$ for the decomposition of $36\, ml$ of water ?
- A$1.788\, K\,Cal$
- B$2.576\, K\,Cal$
- ✓$-1.788\, K\,Cal$
- D$-2.576\, K\,Cal$
✓
Answer
Correct option: C.
$-1.788\, K\,Cal$
c
$36\, \mathrm{ml}-36\, \mathrm{g} \,\mathrm{H}_{2} \mathrm{O}\, \Rightarrow 2 \,\mathrm{mol} \,\mathrm{H}_{2} \mathrm{O}$
$36\, \mathrm{ml}-36\, \mathrm{g} \,\mathrm{H}_{2} \mathrm{O}\, \Rightarrow 2 \,\mathrm{mol} \,\mathrm{H}_{2} \mathrm{O}$
$\mathrm{w}=-\Delta \mathrm{n}_{\mathrm{g}} \mathrm{RT}=-\frac{3 \times 2 \times 298}{1000}=1.788\, \mathrm{KCal}$
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