HW problem 4A.7

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Gisela F Ramirez 2H
Posts: 61
Joined: Fri Sep 28, 2018 12:27 am

HW problem 4A.7

Postby Gisela F Ramirez 2H » Wed Jan 30, 2019 9:12 pm

Calculate the heat that must be supplied to a copper kettle of mass 400.0 g containing 300.0 g of water to raise its temperature from 20.0 degrees Celsius to the boiling point of water, 100.0 degrees Celsius. (given specific heat capacities for water and copper)

Would I find the heat capacity for water and copper separately, and then add those together to get my answer? Using q=mC delta(T)

But then for the second part, how do I find the percentage of heat used to raise the temp of water?

Ava Kjos 1D
Posts: 65
Joined: Fri Sep 28, 2018 12:19 am

Re: HW problem 4A.7

Postby Ava Kjos 1D » Wed Jan 30, 2019 10:28 pm

Yes exactly. The total heat will be the heat required to raise the copper temperature to 100 degrees Celsius (q(copper)) + the heat required to raise the water to 100 degrees Celsius (q(water)), using the formula you listed for both.

For the second part you will just do q(water)/total heat *100% to find the percentage of the total heat used to raise the temperature of water.

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