Question

(b) Why is the magnitude of this value so much larger than the heat of vaporization of water (AH°vap = 41 kJ/mol)? * Choose one: A. Less energy is needed to form attractive forces between water molecules than to break H-H and O-O bonds and form H-O bonds. O B. More energy is needed to form attractive forces between water molecules than to break H-Hand O-O bonds and form H-O bonds. o C. Less energy is needed to break attractive forces between water molecules than to break H-Hand O-O bonds and form H-O bonds. • D. More energy is needed to break attractive forces between water molecules than to break H-H and O-O bonds and form H-O bonds. Part 2 (0.3 point) $ Feedback Calculate the change in energy required in making 76.0 mL of water from its elements under standard conditions. 1210 kJ

Answer 1

For Part B data is not given

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The standard molar heat of formation of water is -285.8 kJ/mol

since density of water is 1g/mL and mass of 1 mol of water is 18 g

hence volume of 1 mol of water = 18mL (density = mass/ volume)

hence mole of water formed = 76 / 18 = 4.2 mol

hence energy required = 4.2 * (-285.8 kJ/mol) = -1206 kJ/mol

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