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1. The problem statement, all variables and given/known data

A 40.0 g block of ice is cooled to -78oC. It is added to 560 g of water in an 80.0 g copper calorimeter at a temperature of 25oC. Determine the final temperature . If not all the ice melts, determine how much ice is left.

2. Relevant equations

Q=mC∆T

Q=mL (phase change)

Q(lost)+ Q(gained)=0

3. The attempt at a solution

energy to bring water to O degrees C

Q=mC∆T

=(.040kg)(4186J/KgC)(0-25C)

=-4186J

Energy to bring copper to 0 degrees C

Q=mC∆T

=(0.800kg)(386J/kgC)(0-25C)

=-7720

Energy to bring ice to 0

Q=mC∆T

=(0.040kg)(?)(0--78)

=? is the specific heat of ice the same as water?

energy phase change

Q=mL

=(.040kg)(?)

is the latent heat of ice the same as the latent heat for freezing water?

and then after finding all that how do i know if there is ice left?

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# Homework Help: Phase changes

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