Paper 1 February/March 2017 CHEMISTRY (9701/12) IGCSE
A student mixed $25.0{\text{ }}c{m^3}$ of $4.00mol\,d{m^{-3}}$ hydrochloric acid with an equal volume of $4.00mol\,d{m^{-3}}$ sodium hydroxide. The initial temperature of both solutions was ${15.0^ \circ }C$. The maximum temperature recorded was ${30.0^ \circ }C$. The heat capacity of the final solution can be assumed to be $4.18J{K^{-1}}{g^{-1}}{\text{ }}$ and the density of this solution can be assumed to be $1.00g\,c{m^{-3}}$.
Using these results, what is the enthalpy…