If the heat of vaporization of HS, is 18.8 kJ/mol, then which is the best calculation to determine what mass of HS is vaporized by the addition of 100 kJ at its boiling point (-61 C)? A) 100 x choice C choice A choice B O choice D 34.1 18.8 B) 18.8 x 61 34.1 C) 34.1 x 18.8 100 D) 100 x 61 18.8