Final answer:
The heat released when 98.54 g of NaOH is completely dissolved is -109.68 kJ.
Step-by-step explanation:
To calculate the heat released when NaOH is completely dissolved, we need to first convert the mass of NaOH to moles. The molar mass of NaOH is 40.00 g/mol, so the number of moles of NaOH is 98.54 g / 40.00 g/mol = 2.46 mol. Next, we multiply the moles of NaOH by the molar heat of solution (-44.51 kJ/mol) to find the heat released: 2.46 mol * -44.51 kJ/mol = -109.68 kJ. Therefore, 98.54 g of NaOH releases -109.68 kJ of heat when completely dissolved.