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Nitrogen

heat of forma...

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heat of formation of ethane -20.2kcal /mol and heat of atomisation of C and H2 are 179.2kcal /mol and 52.1kcal /mol if bond energy of c-h b ond is 73.3 kcal/mol then calculate apprx b.e of C-C

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Q. Heat of atomisation of

N H_{3}

N_{2} H_{4}

x k c a l m o l^{- 1}

y k c a l m o l^{- 1}

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C H_{3} - H

103 k c a l m o l^{- 1}

and heat of formation of

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- 17.88 k c a l m o l^{- 1} .

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103 k c a l / m o l .

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- 94, - 68.3

- 373 k c a l / m o l

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Q. Calculate the heat of formation of diborane

[B_{2} H_{6} (g)]

298 K

if the heat of combustion of it is

- 1941 k J / m o l

and heats of formation of

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