Enthalpy reactions

Determine the molar enthalpy of solution for your assigned salt, if 5.00 g of salt dissolves in 100.0 mL of water. Before the ice/hot pack is activated (i.e. seal broken) it is at room temperature, 22.0 oC. After the ice/hot pack is activated, it’s temperature is ____________ oC. My salt is MgSO4 and final temp is 1.6 oC