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Question

For the reaction,
3N2O(g)+2NH3(g)4N2(g)+3H2O(g); ΔHo=879.6 kJ
If ΔHof[NH3(g)]=45.9 kJ mol1; ΔHof[H2O(g)]=241.8 kJ mol1
Then ΔHof[N2O(g)] will be:

A
+246 kJ
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B
+82 kJ
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C
82 kJ
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D
246 kJ
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Solution

The correct option is B +82 kJ
3NO2(g)+2NH3(g)4N2(g)+3H2O(g);ΔHo=879.6KJ
ΔHo=ΣΔHof(products)ΣΔHof(reactants)
=4ΔHof(N2(g))+3ΔHof(H2O(g))2ΔHof(NH3(g))3ΔHof(N2O(g))
876=(4×0)+3×(241.8)2×(45.9)3×(ΔHof(N2O)(g))
876+725.491.83=ΔHof(N2O(g))
ΔHof(N2O(g))=82KJ/mol

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