How many kilojoules of heat are released when 32.0 g of NaOH are dissolved in water? (The molar heat of solution of NaOH is - 445.1 kJ/mol.)

The energy release when dissolving 1 mol of NaOH in water is 445.1 kJ

the mass of NaOH to be dissolved is 32.0 g

The number of NaOH moles in 32.0 g - 32.0 g / 40 g/mol = 0.8 mol

the energy released whilst dissolving 1 mol of NaOH - 445.1 kJ

when dissolving 0.8 mol - the energy released is 445.1 kJ/mol x 0.8 mol

therefore heat released is - 356.08 kJ

answer is - 356.08 kJ