- #1
DracoMalfoy
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Homework Statement
How much energy must be removed from the system to turn liquid copper of mass 1.5kg at 1083 degrees celsius to solid copper at 1000 degrees celsius?
a. -2.49X10^5J
b. -3.67X10^4J
c. 2.25X10^3J
d. 9.45X10^4J
e. -2.78X10^3J
Homework Equations
Q=Mc(Tf-Ti)
Qtot=Q1+QLf+Q2[/B]
The Attempt at a Solution
Qliqcop+MLf+Qcopsolid=Qtot
M1C1(Tf-Ti)+ MLF+ M2C2(Tf-Ti)=Qtot
(1.5)(.49)(0-1083)+(1.5)(387)+(1.5)(1000-0)=Qtot
Im pretty sure I am doing this incorrectly...