The question is asking you to work out the enthalpy change for the given equation, which essentially means work out the enthalpy change in J/mol. To start off, you'll want to work out the enthalpy change for the experiment using Q=mcΔT.
Ok thanks There is no mass given so would I need to divide the 2.00 mol dm-3 by the molar mass of cuso4 to get it?
We're not given the mass but we can work it out. We're given the volume of copper sulfate solution (100ccm) and the density (1g/ccm) and you can work out the mass from this.