Answered

A person wishes to heat pot of fresh water from 20°C to 100°C in order to boil water for pasta. They calculate that their pot holds 2 kilograms of water. How much heat would have to be used to boil the water?

Verified Answer :

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Given:


Water, 2 kilograms


T1 = 20 degrees Celsius, T2 = 100
degrees Celsius.



Required:


Heat produced



Solution:

Q (heat) = nRT = nR(T2 = T1)

Q (heat) = 2 kilograms (4.184 kiloJoules
per kilogram Celsius) (100 degrees Celsius – 20 degrees Celsius)

Q (heat) = 669.42 Joules
This is the amount of heat
produced in boiling 2 kg of water.

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