Q.

Consider the reaction      4NO2(g)+O2(g)2N2O5(g);                        ΔrH=111kJmol1

If N2O5(s) is formed instead of N2O5(g) in the above reaction, the ΔrH value will be (Given: ΔH of sublimation for N2O5 is 54kJmol1)

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a

54kJmol1

b

219kJmol1

c

219kJmol1

d

165kJmol1

answer is D.

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Detailed Solution

We have 

                       4NO2(g)+O2(g)2N2O5(g) ΔrH=111kJmol1

Add           2N2O5(g)2N2O5(s)4NO2(g)+O2(g)2N2O5(s) ΔrH=2×54kJmol1ΔrH=(111+2×54)kJmol1=219kJmol1

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