To calculate the standard enthalpy change for the dissolution of 5.00 g of potassium chloride KCl in water, we need to first determine the number of moles of KCl and then use the molar heat of solution to find the enthalpy change.1. Calculate the number of moles of KCl:The molar mass of KCl = 39.10 g/mol for K + 35.45 g/mol for Cl = 74.55 g/molNumber of moles = mass / molar massNumber of moles = 5.00 g / 74.55 g/mol = 0.0671 mol2. Calculate the enthalpy change:Standard enthalpy change = number of moles molar heat of solutionStandard enthalpy change = 0.0671 mol -17.95 kJ/mol = -1.204 kJThe standard enthalpy change for the dissolution of 5.00 g of potassium chloride KCl in water is -1.204 kJ.