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## Homework Statement

Part a. A 500 W kettle contains 300g of water at 20°C. Calculate the time it would take to raise the temperature of the water to boiling point.

Part b. The kettle is allowed to boil for 2 minutes. Calculate the mass of water that would remain in the kettle.

State any assumptions you make.

(Specific heat capacity of water = 4.18x10

^{3}J kg

^{-1}°C

^{-1}, specific latent heat of vaporisation of water = 2.26x10

^{6}J kg

^{-1}.)

**2. The attempt at a solution**

I have the answer for part a. It's (rounded) about 201 seconds.

Problem: I don't know where to start from for part b. Someone help.