- #1
HRubss
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Homework Statement
A copper pot with a mass of 0.500 kg contains 0.170 kg
of water, and both are at a temperature of 20.0°C. A 0.250-kg
block of iron at 85.0°C is dropped into the pot. Find the final temperature
of the system, assuming no heat loss to the surroundings.
Homework Equations
Q = cmΔT
ΣQ = 0
The Attempt at a Solution
Since I know that all these materials will reach thermal equilibrium and that the iron will be the only one losing heat so...
CcoppermcopperΔT + CwatermwaterΔT - CironmironΔT = 0
I expanded all the specific heats, brought the individual heats at initial temperature and then solved for Tfinal. I got...
Tfinal = (CcoppermcopperTinitial+CwatermwaterTinitial-CironmironTinitial) /(Ccoppermcopper+Cwatermwater-Cironmiron)
I converted to Kelvin and got about 10.47°C, the answer should be 27.45°C... I don't understand what I did wrong.