Heat capacity of air can be approximately expressed as Cp =...

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Heat capacity of air can be approximately expressed as, C_p = 26.693 + 7.365 × 10^-3 T, where, C_p is in J/mole.K and T is in K. The heat given off by 1 mole of air when cooled at atmospheric pressure from 500°C to -100°C is

A. 10.73 kJ

B. 16.15 kJ

C. 18.11 kJ

D. 18.33 kJ

Answer: Option C

This Question Belongs to Chemical Engineering >> Stoichiometry

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Comments (1)

Mayank Chauhan:

5 years ago

As specific heat is not constant , we have to integrate the term with respect to dt
Change in Enthalpy ( molar) = integration (Cp)dt
Answer : 18.11 kJ

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