Chemistry

Problem

The molar enthalpy of solution for

\mathrm{KNO_3(s)}

+34.9\,\text{kJ}\,\text{mol}^{-1}

. A student dissolves

5.00\,\text{g}

\mathrm{KNO_3}

100.0\,\text{g}

of water that is initially at

25.0\,^{\circ}\!\text{C}

in a coffee-cup calorimeter that does not absorb heat. Assuming the specific heat capacity of the solution is

4.18\,\text{J}\,\text{g}^{-1}\,^{\circ}\!\text{C}^{-1}

, what is the final temperature of the solution? a)

29.1\,^{\circ}\text{C}

19.2\,^{\circ}\text{C}

20.9\,^{\circ}\text{C}

25.0\,^{\circ}\text{C}