Hess law add two routes
A Hess cycle in a water-heating experiment has two route changes \(-200\,\text{kJ mol}^{-1}\) and \(-60\,\text{kJ mol}^{-1}\). Calculate the overall \(\Delta H\). Use the energy diagram labels first, then calculate carefully. Enter the answer and choose the interpretation that matches the chemistry.
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.