Chemistry 9701 · AS & A Level · Chemical energetics

Chemical energetics — practice question

The Data Booklet should be used for this question. A student carried out an experiment to find the enthalpy change for the combustion of methanol. The results below were recorded by the student. Water start temperature: $20\,^{\circ}\text{C}$ Water final temperature: $53\,^{\circ}\text{C}$ Mass of alcohol burner before burning: $259.65\,\text{g}$ Mass of alcohol burner after burning: $259.15\,\text{g}$ Mass of glass beaker together with water: $150.00\,\text{g}$ Mass of glass beaker: $50.00\,\text{g}$ How much of the heat energy released by the burning of methanol was transferred into the water?

  • A$209\,\text{J}$
  • B$13\,794\,\text{J}$
  • C$20\,691\,\text{J}$
  • D$22\,154\,\text{J}$

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