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`298 K` पर `C-H, C-C, C=H` तथा `H-H` बांधों की बांध उर्जाये क्रमशः 414, 347, 615 तथा 435 किलजूल मोल`""^-1 ` है | निम्नलिखित अभिक्रिया के लिए एन्थेलपी परिवर्तन ज्ञात करें :
`CH_2=CH_2(g)+H_2(g)toCH_(3)-CH_(3)(g)`
A. `+125` किलो जूल
B. `-125 ` किलो जूल
C. `+250` किलो जूल
D. `-250` किलो जूल

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Correct Answer - B
`DeltaHH=-[e_(C-C)+6xxe_(C-H)]+[e_(C-C)+4xxe_(C-H)+e_(H-H)]`
`=-[347+6xx414]+[615+4xx414+435]`
`= -125 kJ `

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