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The heat of combustion of CH(4) is -400 ...

The heat of combustion of `CH_(4) is -400 KJ mol^(-1)`. Calculate the heat released when 40g of `H_(2)O` is formed upon combustion :-

A

`+444.4 KJ`

B

`+888.8 KJ`

C

`-444.4 KJ`

D

`-888.8 KJ`

Text Solution

Verified by Experts

The correct Answer is:
C
`CH_(4)+2O_(2)toCO_(2)+2H_(2)O,=-400KJ//mol`
`because` for 2mole or 36 gm water, heat released `=-400KJ//mol`
`:.` for gm water, heat released will be
`=(-400)/(36)xx40`
`-444.44 KJ`
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