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For the hypothetical reaction A(2(g)) + ...

For the hypothetical reaction `A_(2(g)) + B_(2(g)) hArr 2AB_((g)) Delta_(r ) G^(@) and Delta_(r)S^(@)` are 20 kJ/mol and `-20 JK^(-1) mol^(-1)` respectively at 200K. If `Delta_(r)C_(P)` is `20 JK^(-1) mol^(-1)` then `Delta_(r ) H^(@)` at 400K is

A

20kJ/mol

B

7.98kJ/mol

C

28kJ/mol

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
A
`Delta H_(200K)^(0) = Delta G^(0) + T Delta S^(0)`
`= 20 + ((-20) xx 200)/(1000) = 16` kJ/mol `Delta H_(400K)^(0) = (20 xx 200)/(1000) + 16 = 20`
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