To calculate the standard enthalpy change for the dissolution of NaOH, we first need to determine the number of moles of NaOH being dissolved. 1. Calculate the moles of NaOH:NaOH has a molar mass of 22.99 g/mol Na + 15.999 g/mol O + 1.007 g/mol H = 39.996 g/mol.moles of NaOH = mass / molar massmoles of NaOH = 5.36 g / 39.996 g/mol = 0.134 mol2. Calculate the enthalpy change:Now that we have the moles of NaOH, we can calculate the enthalpy change using the molar enthalpy of dissolution.H = moles molar enthalpy of dissolutionH = 0.134 mol -44.5 kJ/mol H = -5.963 kJThe standard enthalpy change for the dissolution of 5.36 g of NaOH in 100.0 mL of water is -5.963 kJ.