InterviewSolution
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InterviewSolution
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A reaction from unknown reactants (R) : `R rarr P` is molar entropy of the products (P) is measured to be 460 J/mol K, and 71.3 kJ of heat was given off in the process to the surroundings when 1 mol reacted, then the molar entropy of the reactants has to beA. at least -230 J/mol KB. at the most 690 J/mol KC. at the most 230 J/mol KD. at the least 690 J/mol K |
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Answer» Correct Answer - B Let us solve this at boundary condition of `Delta G^(@) = 0` `Delta S^(@) = (Delta H^(0))/(T) = (-71.3 xx 1000)/(310) = -230 JK^(-1)` `rArr -230 JK^(-1) = S_(m)^(0) (R) = 460 JK^(-1) - S_(m)^(0) (R)` `rArr S_(m)^(0) (R) = 690 JK^(-1)`. It is the maximum value of entropy which the reactant can have. If `S_(m)^(0) gt 690 JK^(_1) mol^(-1), Delta G^(0) gt 0` |
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