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water boils at 95^{\circ} C in Denver the miles high city calculate the atmospheric pressure in Denver \Delta H_{vap} for H_{2}O = 40.67 Kg mol^{-1}

 

  • Option 1)

    70  cm Hg

  • Option 2)

    76 cm Hg

  • Option 3)

    63.6 cm Hg

  • Option 4)

    40 cm Hg

 

Answers (1)

best_answer

As we learned

 

Clausis - Clapreyon equation -

log\frac{P_{2}}{P_{1}}= \frac{\Delta H_{vap}}{2.303R}\left [ \frac{1}{T_{1}}- \frac{1}{T_{2}} \right ]

- wherein

Relationship between V.P.& Temperature

 

 

According to Clapeyron equation  

2.303 \log \frac{P_{2}}{P_{1}}= \frac{\Delta H}{R}\frac{[T_{2}-T_{1}]}{T_{1}T_{2}}

(As P_{2}=76cm), T_{2}=373k, T_{1}=368k)

\log \frac{P_{2}}{P_{1}}=\frac{40.67\times 10^{3}}{8.314\times 2.303}\times \left [ \frac{373-368}{373\times 368} \right ]

\frac{P_{2}}{P_{1}}=1.195

P_{1}=\frac{76}{1.195}=63.6cm Hg


Option 1)

70  cm Hg

Option 2)

76 cm Hg

Option 3)

63.6 cm Hg

Option 4)

40 cm Hg

Posted by

satyajeet

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