IB Chemistry SL R1.1 Measuring enthalpy changes questions

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Question 1

Paper 2Medium4 marks

A student burns ethanol, C₂H₅OH, completely in oxygen to heat 200.0 g of water. The mass of ethanol consumed is 0.460 g, and the water temperature rises from 20.00 °C to 23.40 °C. The experiment is carried out at constant pressure.

Refer to the data booklet for the relative atomic masses and the specific heat capacity of water.

(a)

Determine the experimental molar enthalpy change of combustion of ethanol, in kJ mol⁻¹, to three significant figures.

[3]
(b)

Using the sign of your answer to (a), identify whether the reactants or the products are more stable.

[1]

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