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(a) How much energy does it take to heat 250 g of water from 20 ◦C...

(a) How much energy does it take to heat 250 g of water from 20 ◦C to the boiling point of 100 ◦C? (The specific heat of water is 4190 J/kg · K)

(b) (Suppose you wanted to cause the temperature change in part (a) by using an 800W microwave. If we assume all the power delivered by the microwave goes into the water, how long will it take for the water to change temperature?

(c) The heat of vaporization for water is 22.6×105 J/kg. How much energy is required to completely boil the water after it reaches 100 ◦C? How long does this take in the microwave?

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