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

According to second law of thermodynamics, heat is partly converted into useful work and part of it...During isothermal expansion of the mole of an ideal gas from 10 atm at 273K, the workdone is [gas constant = 2]:...The work done in the isothermal reversible expansion of argon gas at 27°C from 4 L to 16 L was equal to 4200 cal. What i...The pressure and density of a diatomic gas ($\gamma$ = 7/5) change from (P1, d1) to (P2, d2) adiabatically. If d2/d1 = 3...For which of the following change ᐃH ≠ ᐃE ?...