1.

Choose the reaction in which DeltaH is not equal to DeltaU

Answer»

`C_((gr))+O_(2(g))rarrCO_(2(g))`
`C_(2)H_(4(g))+H_(2(g))rarrC_(2)H_(6(g))`
`2C_((gr))+H_(2(g))rarrC_(2)H_(2(g))`
`H_(2(g))+I_(2(g))rarr2HI_((g))`

SOLUTION :`DeltaH=DeltaU+Deltan_(g)RT`
`"When "Deltan_(g)=0, DeltaH=DeltaU`
For (a), `Deltan_(g)=0`
`(b) Deltan_(g)=1-2=-1`
(C) `Deltan_(g)=0`
(d)` Deltan_(g)=2-2=0`
`(e) Deltan_(g)=2-2=0`


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