Q.

Bond energy of N-H  bond is y kJ mol-1 under standard state. Thus, change in internal energy in the following process isNH3g →  Ng + 3Hg

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a

-3y kJ mol-1

b

-y kJ mol-1

c

3y kJ mol-1

d

y kJ mol-1

answer is C.

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Detailed Solution

H-N|H  -H three N-H  bondsThus, ∆E=3y  kJ mol-1
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Bond energy of N-H  bond is y kJ mol-1 under standard state. Thus, change in internal energy in the following process isNH3g →  Ng + 3Hg