MCQ
The enthalpy of vapour is $10\ kcal/mole$ higher than liquid at $350\ K$ and $2\ atm$ . Under given conditions, the difference in internal energy of vapour and liquid will be ......$cal.$
- A$10700$
- B$-9300$
- ✓$9300$
- D$-10700$
✓
Answer
Correct option: C.
$9300$
c
$\mathrm{H}_{2} \mathrm{O}(l) \rightarrow \mathrm{H}_{2} \mathrm{O}(\mathrm{g})$
$\mathrm{H}_{2} \mathrm{O}(l) \rightarrow \mathrm{H}_{2} \mathrm{O}(\mathrm{g})$
$\Delta \mathrm{H}=\Delta \mathrm{U}+\Delta \mathrm{ngRT}$
$10000=\rightarrow \mathrm{U}+1 \times 2 \times 350$
$ \Rightarrow $ $\Delta \mathrm{U}=9300 \,\mathrm{cal}$
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