Exothermic and endothermic reactions — practice question

The reaction of a metal with dilute sulfuric acid is exothermic. Devise an experiment to find out whether magnesium or zinc gives out more thermal energy per gram of metal when it reacts with excess dilute sulfuric acid. You are given magnesium powder, zinc powder, dilute sulfuric acid and ordinary laboratory apparatus. Do not use any other chemicals. Your plan should state: the apparatus required; the method to follow and the measurements to make; how the measurements are used to decide which metal releases more thermal energy per gram. A diagram may be included if it helps answer the question.