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  •  The molar heat capacity (Cp) of CD2O is 10 cals at 1000 K. The change in entropy (in cal deg-1) associated with cooling of 32 g of CD2O vapour from

 The molar heat capacity (Cp) of CD2O is 10 cals at 1000 K. The change in entropy (in cal deg-1) associated with cooling of 32 g of CD2O vapour from 1000 K to 100 K at constant pressure will be :

(D = deuterium, at. mass = 2 u)

Option: 1

23.03


Option: 2

-23.03


Option: 3

2.303


Option: 4

-2.303


Answers (1)

best_answer

Entropy for isobaric process -

\mathrm{\Delta S = n\, C_{p}\ln \frac{T_{f}}{T_{i}}}

\\\mathrm{\Delta S=nC_{p}1n\left ( \frac{T_{2}}{T_{1}} \right )} \\\\\mathrm{ \Delta S = 2.303\times n\times C_{p} \: log\left ( \frac{T_{2}}{T_{1}} \right )}

                                  \mathrm{\Delta S = 2.303\times 1\times 10 \: log\left ( \frac{100}{1000} \right )}                    \mathrm{\Delta S= -23.03 \: cal \: deg^{-1}}

Posted by

Sanket Gandhi

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