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The molar heat capacities at constant pr...

The molar heat capacities at constant pressure (assume constant with respect to temperature) of A, B and C are in ratio of `1.5 : 3.0 : 2.0`. If enthalpy change for the exotherimic reaction `A + 2B rarr 3C` at `300 K` is `-10 kJ//"mol"` & `C_(p.m)` (B) is 300 J/mol then enthalpy change at 310 K is:

A

`-8.5 kJ//mol`

B

`8.5 kJ//mol`

C

`-11.5kJ//mol`

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
C
`DeltaH=DeltaC_(P)DeltaT`
`H_(2)+10=[600-150+600)] 10^(-3)xx(310-300)`
`H_(2)=-1.5-10=-11.5" kJ/mol"`
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