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Consider the reactions given below .On t...

Consider the reactions given below .On the basis of these reactions ,Find out which of the algebraic relations given in options (a) to(d) is correct?
`(p)C(g)+4H(g)toCH_(4)(g), Delta_(r)H=xKJ mol^(-1)`
`(Q)C("graphite")+2H_(2)(g)to CH_(4)(g),`
`Delta_(r)H=yKJmol^(-1)`

A

`x=y`

B

`x=2y`

C

`xgty`

D

`xlty`

Text Solution

Verified by Experts

The correct Answer is:
C
`DeltaH` (Heat of reaction) = `sum` Bond energy of reaction
`-sum` Bond energy of products
Bond energy of products are same in both reactions but bond energy of reactants are different. In second reaction, some energy is used to decompose the bonds of the molecule.
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