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Choose the reaction in which DeltaH is n...

Choose the reaction in which `DeltaH` is not equal to `DeltaU`.

A

a) C(graphite) `+O_(2)(g)rarrCO_(2)(g)`

B

b) `C_(2)H_(4)(g)+H_(2)(g)rarrC_(2)H_(6)(g)`

C

c) 2C(graphite) `+H_(2)(g)rarrC_(2)H_(2)(g)`

D

d) `H_(2)(g)+I_(2)(g)rarr2HI(g)`

Text Solution

Verified by Experts

The correct Answer is:
B
The reaction for which `Deltan_(g)ne0,DeltaHneDeltaU`
because `DeltaH=DeltaU+Deltan_(g)RT`
`Deltan_(g)=n_(P)-n_(R)`
(where, `n_(P)andn_(R)` represent the number of moles of gaseous products and reactants respectively.)
(a) C(graphite) `+O_(2)(g)rarrCO_(2)(g), Deltan_(g)=n_(P)-n_(R)=1-1=0`
(b) `C_(2)H_(4)(g)+H_(2)(g)rarrC_(2)H_(6)(g), Deltan_(g)=1-2=-1`
(c ) 2C(graphite) `+H_(2)(g)rarrC_(2)H_(2)(g), Deltan_(g)=1-1=0`
(d) `H_(2)(g)+I_(2)(g)rarr2HI(g), Deltan_(g)=2-2=0`
(e) `N_(2)(g)+O_(2)(g)rarr2NO_(g), Deltan_(g)=2-2=0`
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