HW problem 4A. 13

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

HW problem 4A. 13

Postby Gisela F Ramirez 2H » Tue Feb 12, 2019 9:02 pm

An ice cube of mass 50.0g at 0.0 degrees celsius is added to a glass containing 400.0 g of water at 45.0 degrees celsius. What is the final temp of the system?

I understand what to do but when I try to plug everything in, I am not getting the right answer. Im not sure if it's because i have to convert some units??

I have: n(delta H fusion, molar) + m(ice) C(T final) = -m(water) C(T final - 45)

I am using the specific heat capacity of water on both sides, but I am confused on the side that calculates for ice? The units don't all cancel out?

Becky Belisle 1A
Posts: 81
Joined: Fri Sep 28, 2018 12:18 am

Re: HW problem 4A. 13

Postby Becky Belisle 1A » Tue Feb 12, 2019 9:19 pm

The mass of ice is in grams, specific heat capacity is in J/(°C x g), and temperature is in °C. Thus, when mCΔT is multiplied out, the units should all cancel besides Joules.

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