final weight of lamp original volume of oil time it took for lamps to use oil height of flame produced by lamp
I gave my students this multiple choice question: Two identical lamps contain the same amount of different types of oil. They are allowed to burn until all the oil has been burned. Which measurement will best provide the total difference in chemical energy between the two oils?

Only one answer is correct among these 4 choices:
- final weight of lamp
- original volume of oil
- time it took for lamps to use oil
- height of flame produced by lamp

Could you tell me which one is correct?

time it took for lamps to use oil