IB skill practice

Use Gibbs energy to predict spontaneity

Paper 1, Paper 2 5 marks Difficulty 4

Temperature threshold for spontaneity

A process in a IA data review session has \(\Delta H=85\,\text{kJ mol}^{-1}\) and \(\Delta S=150\,\text{J K}^{-1}\text{mol}^{-1}\). Estimate the temperature where \(\Delta G=0\). Use the labelled diagram, graph, or data table before calculating. Enter the answer and choose the interpretation that matches the HL chemistry evidence.

Worked practice: chemistry evidence and answer

Use the chemical evidence first, then enter the result and interpretation that match it.