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How much energy is released when 6 mole ...

How much energy is released when 6 mole of octane is burnt in air? Given`Delta H_(f)^(0) " for " CO_(2(g)), H_(2)O_((g)) and C_(8)H_(18(l))` respectively are `-390, -240 and +160` KJ/mol

A

`-32.6 MJ`

B

`-37.4 MJ`

C

`-35.5 MJ`

D

`-20.00 MJ`

Text Solution

Verified by Experts

The correct Answer is:
A
`C_(8) H_(18) + (25)/(2) O_(2) rarr *CO_(2) + 9H_(2)O`
`Delta H_("comb") = 8 Delta H_(f_(CO_(2))) + 9Delta H_(f_(H_(2)O)) - Delta H_(f_(C_(8)H_(18)))`
`= 8 xx(-390) + 9 xx (-240) - (+160)`
`= --5400` kJ/mol
For 6 moles `= -32640kJ = - 32.6` MJ
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