1. A student carried out an experiment to find the enthalpy change for a reaction between zinc and copper(II) sulfate solution.

• The student used a measuring cylinder to place 70 cm³ of 0.500 mol dm^–3 copper(II) sulfate solution into a polystyrene cup.

• The student recorded the temperature at one-minute intervals for three minutes.

• At the fourth minute the student added 2.00 g of zinc powder and stirred the mixture, but did not record the temperature.

• The student recorded the temperature at one-minute intervals for a further eight minutes.

• After plotting a graph of their results, the student determined that the temperature change, ΔT, for the reaction was 21.70 ^oC.

Assume that the density of the solution is 1 g cm^-3 and the specific heat capacity of the solution is 4.18 J K^-1 g^-1.

What is the enthalpy change for this reaction between zinc and copper(II) sulfate solution?