1. The problem statement, all variables and given/known data Suppose I have a solute of mass "x" grams. I dissolve this in "y" mL of water. The temperature of the water increases by "z" degrees Celsius. I calculate the molar heat of dissolution of the solute by measuring, using q=mwatercΔt, the heat absorbed by water (in kJ), and then dividing by the moles of solute. The above mentioned method is found in many reference textbooks as well as various sources across the web. However, my science instructor insists that this method is wrong, and to calculate the heat transferred, you should include the mass of the solute as well. Thus, when measuring the heat absorbed it should look like this: q=msolute + solventcΔt I find this quite unintuitive; I don't agree with my instructor on this matter. Am I right or wrong?