A sample of 10.0 g ammonium nitrate (M = 80.1) is added to 100.0 g water in a well-insulated contain — Thermochemistry Chemistry Question

A sample of 10.0 g ammonium nitrate (M = 80.1) is added to 100.0 g water in a well-insulated container. The solid and liquid are both initially at 22.0 °C, and the temperature of the solution after the ammonium nitrate has dissolved is 15.1 °C. What is the enthalpy of solution of ammonium nitrate? You may assume that the specific heat capacity of the solution is the same as that of pure water, 4.184 J g^-1 K^-1.
NH₄NO₃(s) → NH⁴⁺(aq) + NO₃–(aq) ∆H°soln = ???