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When enthalpy and entropy change for a c...

When enthalpy and entropy change for a chemical reaction are `-2.5 xx10^(3)` cals and `7.4` cals `deg^(-1)` respectively. Predict that reaction at 298 K is

A

revesible

B

spontaneous

C

non-spontaneous

D

irreversible

Text Solution

Verified by Experts

The correct Answer is:
B
Heat at constant pressure means enthalpy i.e, `Delta H= 2.5 xx 10^(3)` cal `Delta S= 7.4` cal `"deg"^(-1)`
T=29K
`Delta G= Delta H- T Delta S`
`=2.5 xx 10^(3)-298 xx 7.4`
=4705cal
Hence, the process is spontaneous.
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