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# How do you solve this chemistry problem? A beaker that contains 500g of liquid water is heated until all the water is completely evaporated.?

A. Calculate the total energy required to heat the water from 25 degrees C (room temp.) to its boiling point.

B. Calculate the total energy required to vaporize all the water to steam.

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- electron1Lv 712 months agoFavorite Answer
The following information is from two tables in my physics book. The specific heat of water is 4,186 J/(kg * ˚C). The heat of vaporization of water is 2.26 * 10^6 J/kg. For increasing the temperature of the water, use the following equation.

Q = mass * specific heat * ∆ T

Q1 = 0.500 * 4,186 * 75 = 156,975 J

For evaporating, use the following equation.

Q = mass * heat of vaporization

Q2 = 0.500 * 2.26 * 10^6 = 1.13 * 10^6 J

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