Formation enthalpy from data
In a environmental chemistry case study, the sum of product formation enthalpies is \(-352\,\text{kJ mol}^{-1}\) and the sum of reactant formation enthalpies is \(-158\,\text{kJ mol}^{-1}\). Calculate \(\Delta H_{\text{rxn}}\). 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.
Write a full answer
Now write the response in full, in your own words — this is what the exam asks for. The AI marks it on the same moves you built above (focus, evidence, technique, judgement) and gives feedback on reasoning, evidence, and expression.