Answer:
∴ Q = m·ΔHv = 15g x 540 cals/g = 8100 calories = 33,890 joules
Step-by-step explanation:
Phase transition formula => Q = m·ΔHv
Q = amount of heat absorbed
ΔHv = Heat of vaporization = 540 cal/g = 25,594 joules/g at 100°C
m = mass of substance = 15 grams
∴ Q = m·ΔHv = 15g x 540 cals/g = 8100 calories = 33,890 joules