Question 1
Paper 2Medium4 marksA 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)[3]
Determine the experimental molar enthalpy change of combustion of ethanol, in kJ mol⁻¹, to three significant figures.
(b)[1]
Using the sign of your answer to (a), identify whether the reactants or the products are more stable.