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Q.

The molar heat capacity (Cp) of CD2O is 10 cals at 1000 K. The change in entropy associated with cooling of 32 g of CD2O vapour from 1000 K to 100 K at constant pressure will be: (D= deuterium, atomic mass = 2 u)

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a

23.03 cal deg-1

b

-23.03 cal deg-1

c

2.303 cal deg-1

d

-2.303 cal deg-1

answer is B.

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Detailed Solution

For isothermal reversible expansion

∆S= - 2.303nCp logT2T1

= - 2.303 x 1 x 10 x log10

= - 23.03

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The molar heat capacity (Cp) of CD2O is 10 cals at 1000 K. The change in entropy associated with cooling of 32 g of CD2O vapour from 1000 K to 100 K at constant pressure will be: (D= deuterium, atomic mass = 2 u)