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Consider the followig reactions: C+O(2...

Consider the followig reactions:
`C+O_(2)toCO_(2),""""" Delta=-400kJmol^(-1)`
`2H_(2)+O_(2)to2H_(2)O, """""DeltaH=-570kJmol^(-1)`
`CO_(2)+H_(2)OtoCH_(4)+20_(2)"""""Delta=890kJmol^(-1)`
The heat of formation of methane is

A

`-180kJ mol^(-1)`

B

`-1060kJ mol^(-1)`

C

`-720kJmol^(-1)`

D

`-80kJmol^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
D
Add equations (i),(ii)and (iii)
`C+O_(2)toCO_(2),""""DeltaH=-400 kJmol^(-1)`
`2H_(2)+O_(2)to2H_(2)O,""""DeltaH=-570kJmol^(-1)underline(CO_(2)+2H_(2)O)toCH_(4)+20_(2),DeltaH=890kJmol^(-1)`
`C+2H_(2)OtoCH_(4),""""DeltaH=-80kJmol^(-1)` `therefore` Heat of formation of methane is -80 kJ `mol^(-1)`
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