Please Answer All Questions

Water is heated to boiling under a pressure of 1 atm. Then heat is added by applying an electric current of 1 A from a 24 V supply for 600 seconds through a resistance in thermal contact with the water.

(1) What is the heat supplied to the water?

(2) The heat is supplied at constant pressure (1 atm). What is the change in enthalpy and why?

(3) The water is at its boiling temperature. The addition of heat is causing the water to vaporize (it will not cause a temperature rise). It is found that 6.384 g of water is vaporized by adding the heat that you calculated in a). Calculate the number of moles of water that have been vaporized.

(4) By knowing the number of moles that have been vaporized and the amount of heat that is required to achieve that amount of vaporization (at constant pressure) you can calculate the molar enthalpy of vaporization of water. It is given by the amount of heat supplied (at the boiling temperature, constant pressure) divided by the number of moles that have been vaporized.

Calculate the molar enthalpy of vaporization of water, _vapH(H₂O) at the boiling temperature (373 K).