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

$\Delta S = n.C_{P,m}.\ln\frac{T_{2}}{T_{1}} = \frac{3.2}{32} \times 14 \times \ln\frac{900}{1000} = - 0.14\text{ cal/K}$

Create a free account to view solution

View Solution Free
Topic: Thermodynamics·Practice all Thermodynamics questions

More Thermodynamics Questions

(ᐃH - ᐃU) for the formation of carbon monoxide (CO) from its elements at 298 K is (R = 8.314 J K-1 mol-1)...Select the correct statement...Two moles of an ideal gas is expanded isothermally and reversibly from 1L to 10L at 300K. The enthalpy change (in KJ) fo...If a triatomic non-linear gas is heated isothermally, then what percentage of the heat energy is used to increase the in...A gas is heated at constant pressure. The fraction of heat absorbed used in doing work is...