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Q.

The standard molar enthalpy of vaporization of benzene ΔvapH0  at 353 K is 30.8 kJ mol−1 .  If the benzene vapour behave as an ideal gas, the change in internal energy of vaporization of 78g of benzene at 353 K in  kJ mol−1 is

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a

33.74

b

37.87

c

27.87

d

17.87

answer is B.

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