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5. Thermodynamics and thermochemistry — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry5. Thermodynamics and thermochemistry1 Mark
MCQ
The heat of vaporisation and heat of fusion of $H_2O$ are $540\, cal/g$ and $80 \,cal/g.$ The ratio of  $\frac{{{\Delta _S{vap}}}}{{{\Delta _S{fusion}}}}$ for water is :-
  • A
    $6.75$
  • B
    $9.23$
  • ✓
    $4.94$
  • D
    $0.2$
✓

Answer

Correct option: C.
$4.94$
c
$\Delta S_{v}=\frac{\Delta H_{v}}{B \cdot p t}=\frac{540}{373} ; \Delta S_{f}=\frac{\Delta H_{f}}{F \cdot p t}=\frac{80}{273}$

$\therefore \quad \frac{\Delta \mathrm{S}_{\mathrm{v}}}{\Delta \mathrm{S}_{\mathrm{f}}}=\frac{540}{373} \times \frac{273}{80}=4.94$

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