Dissolving solid NaOH in water is exothermic according to
NaOH(s) → Na+(aq) + OH−(aq) ΔH = −44.5 kJ mol−1
A student prepares 250. mL of 2.00 M NaOH(aq) by dissolving NaOH pellets in excess water at 25 °C. Determine the total heat (in kJ) released during the dissolution, assuming the final solution volume is 250. mL.