Calculate the mass of water (in g) that can be vaporized at its boiling point with 155 kJ of heat.

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SORT You are given a certain amount of heat in kilojoules and asked to find the mass of water that can be vaporized. STRATEGIZE The heat of vaporization gives the relationship between heat absorbed and moles of water vaporized. Begin with the given amount of heat (in kJ) and convert to moles of water that can be vaporized. Then use the molar mass as a conversion factor to convert from moles of water to mass of water. GIVEN: 155 kJ FIND: g H₂O CONCEPTUAL PLAN kJ 1 mol H₂0 40.7 kJ mol H₂O 18.02 g H₂O 1 mol H₂0 RELATIONSHIPS USED AHvap = 40.7 kJ/mol (at 100 °C) 18.02 g H₂O= 1 mol H₂O g H₂O