3.
In an experiment, 2 g of magnesium powder are added to 50 cm3 of 0.2 mol dm–3 zinc sulphate solution. The temperature of the mixture increases by 12°C. What is the heat of displacement in this experiment?[Spesific heat capacity of a solution = 4.2 Jg–1 °C–1; Relative atomic mass of Mg = 24]