Heats of combustion of C2H4, H2 and C2H6...

Heats of combustion of `C_2H_4, H_2 and C_2H_6` are `-1409 K.J, -285 K.J and -1558 KJ`. Heat of hydrogenation of ethylene is

`-136 KJ`

`-240 KJ `

`136 KJ`

` 227 KJ`

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