Select the correct enthalpy at corresponding temperature us…

Chemistry Thermodynamics and Thermochemistry General Single Correct MCQ

Published by: CGP EDU Academic Team

Published on: August 12, 2026

Select the correct enthalpy at corresponding temperature using following datas

(i) Heat capacity of solid from 0 K to normal melting point 200 K

C P,m (s) = 0.035 T JK –1 mol –1 .

(ii) Enthalpy of fusion = 7.5 KJ mol –1 ,

(iii) Enthalpy of vaporisation = 30 KJ mol –1

(iv) Heat capacity of liquid form 200 K to normal boiling point 300 K

C P,m ( λ ) = 60 + 0.016 T JK –1 mol –1 .

(v) Heat capacity of gas from 300 K to 600 K at 1 atm

C P,m (g) = 50.0 JK –1 mol –1 .

S 200 (s) = 7

S 300 ( λ ) = 70.43

S 300 (g) = 170.43

S 600 (g) = 205.09

Text Solution

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The correct answer is:

CHECK THE SOLUTION.

(a,b,c,d)

S 200 = = 7 J mol –1 K –1

S 200 ( l ) = 7 + = 44.5 J mol –1 K –1 S 300 ( l ) = 44.5 + = 44.5 + 60 ln + 1.6 = 70.43 J mol

–1 K –1 S 300 (g) = 70.43 + = 170.43 J mol

–1 K –1

S 600 (g) = 170.43 + 50 ln = 205.09 JK –1 mol –1

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