Problem: Heating a cup of water to near boiling temperature to use for tea takes time. If 300 mL of water at 23oC is heated on 250 W stove, how long will it take for the water to reach 100oC? If the water is left for 1 minute too long, what percentage of the water evaporated by the time you remove the water from the stove? Assume that the stove outputs 250 W of heat. Note that the specific heat of water is 4.184 kJ/kgK and the latent heat of vaporization of water is 2260 kJ/kg.

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Problem Details

Heating a cup of water to near boiling temperature to use for tea takes time. If 300 mL of water at 23oC is heated on 250 W stove, how long will it take for the water to reach 100oC? If the water is left for 1 minute too long, what percentage of the water evaporated by the time you remove the water from the stove? Assume that the stove outputs 250 W of heat. Note that the specific heat of water is 4.184 kJ/kgK and the latent heat of vaporization of water is 2260 kJ/kg.

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Our tutors have indicated that to solve this problem you will need to apply the Changes in Phase & Latent Heat concept. You can view video lessons to learn Changes in Phase & Latent Heat. Or if you need more Changes in Phase & Latent Heat practice, you can also practice Changes in Phase & Latent Heat practice problems.

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