Water boils at 373 k. the molar enthalpy of vaporization for water is 40.7 kj/mol. if one mole of water is at 373 k when it starts to boil, its temperature when it all has boiled will be a. 273 k c. 373 k b. 343 k d. 413 k

373 K.

When water is boiling liquid is passing to vapor phase and all the heat is used by the molecules to gain the necessary energy to make the change; so during this change of phase the temperature of the water does not increase. That is why the temperature remains constant during the change of phase.