The dissolution of 1 mole of in 100 mole of give rise to evolution of heat as

CHEMISTRY · Subjective · A Level · Chemistry · Energetics · Energetics

Problem

The dissolution of 1 mole of

\text{NaOH}(s)

in 100 mole of

\text{H}_2\text{O}(l)

give rise to evolution of heat as

-42.34\,\text{kJ}

. However, if 1 mole of

\text{NaOH}(s)

is dissolved in 1000 mole of

\text{H}_2\text{O}(l)

, the heat given out is

42.76\,\text{kJ}

. What would be enthalpy change when 900 mole of

\text{H}_2\text{O}(l)

are added to a solution containing 1 mole of

\text{NaOH}(s)

in 100 mole of

\text{H}_2\text{O}(l)