ThermodynamicsHard
Question
Molar heat capacity of CD2O (deuterated form of formaldehyde) vapour at constant pressure is vapour 14 cal/K-mol. The entropy change associated with the cooling of 3.2 g of CD2O vapour from 1000 K to 900 K at constant pressure is (assume ideal gas behaviour for CD2O) [ln 0.9 = −0.1]
Options
A.+0.14 cal/K
B.– 0.14 cal/K
C.−1.4 cal/K
D.+1.4 cal/K
Solution
$\Delta S = n.C_{P,m}.\ln\frac{T_{2}}{T_{1}} = \frac{3.2}{32} \times 14 \times \ln\frac{900}{1000} = - 0.14\text{ cal/K}$
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