To calculate the amount of heat absorbed when sodium hydroxide is dissolved in water, we need to use the following formula:q = n Hwhere q is the heat absorbed in joules , n is the number of moles of NaOH, and H is the enthalpy of solution in joules per mole .First, we need to find the number of moles of NaOH. The molar mass of NaOH is:NaOH = Na + O + H = 22.99 g/mol + 16.00 g/mol + 1.01 g/mol = 40.00 g/molNow, we can find the number of moles n of NaOH:n = mass / molar mass = 10 g / 40.00 g/mol = 0.25 molNext, we need to convert the enthalpy of solution from kilojoules per mole to joules per mole:H = -44.51 kJ/mol 1000 J/1 kJ = -44510 J/molNow, we can calculate the heat absorbed q :q = n H = 0.25 mol -44510 J/mol = -11127.5 JSince the value is negative, it means that the heat is released exothermic reaction rather than absorbed. Therefore, the amount of heat absorbed is 0 J, and the amount of heat released is 11127.5 J.