To calculate the amount of heat required to vaporize the 50 g of water, we can use the following formula:q = n * Hvapwhere q is the heat required, n is the number of moles of water, and Hvap is the enthalpy of vaporization.First, we need to determine the number of moles of water. The molar mass of water is 18.015 g/mol. n = mass / molar massn = 50 g / 18.015 g/moln 2.776 molesNow, we can calculate the heat required:q = n * Hvapq = 2.776 moles * 40.7 kJ/molq 112.98 kJTherefore, approximately 112.98 kJ of heat is required to vaporize 50 g of water at its boiling point.