Question

2 mol of an ideal gas expanded isothermally & reversibly from 1 litre to 10 litres at 300 K. What is the enthalpy change?

(A) 4.98 K J 

(B) 11.47 K J

(C) -11.47 K J 

(D) 0 K J

Answer 1

Correct option (D) 0 K J

Explanation:

H = E + PV

and ΔH = ΔE + Δ(PV)

or ΔH = ΔE + nRΔT

ΔT = 0

ΔE = 0

∴ ΔH = 0