1.

The values of Delta H and Delta Sof a certain reaction are- 400 kJ "mol"^(-1) and -20 kJ "mol"^(-1)K^(-1)respectively. The temperature below which the reaction spontaneous is

Answer»

100K
`20^@C`
`20K`
`120^@C`

SOLUTION :`Delta G = Delta H - T Delta S`
Now for a reaction to be spontaneous , `Delta G lt 0`
` therefore Delta H - T Delta S lt 0`
` rArr - 400 - T ( -20) lt 0 rArr - 400 + 20 T lt 0`
` therefore 20T lt 400 rArr T lt 20K`


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