Chemical Thermodynamics Question 251

Question: For the reaction A(g)+2B(g)2C(g)+3D(g) , the value of ΔE at 27oC is 19.0 kcal. The value of ΔH for the reaction would be (R=2.0,cal,K1mol1) [Roorkee Qualifying 1998]

Options:

A) 20.8 kcal

B) 19.8 kcal

C) 18.8 kcal

D) 20.2 kcal

Show Answer

Answer:

Correct Answer: D

Solution:

Use ΔH=ΔE+Δn,RT

ΔH=19+2×2×103×300

=20.2,kcal ; Δn=2 .



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