Homework Answers
Free energy change = 134 kJ
Maximum amount of useful work = none
Explanation
Given : Standard free energy change = 107.0 kJ
moles of HBr = 2.50 mol
free energy change = (Standard free energy change) * (moles of HBr)
free energy change = (107.0 kJ / 2 mol HBr) * (2.5 mol HBr)
free energy change = 133.75 kJ
Since free energy change is positive, therefore work has to be done on the system to make the reaction proceed forward. Work done by the system will be zero.
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