- #1
kimkibun
- 30
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Homework Statement
An aluminum container whose mass is 205g contains 300g of water at 20°C. In this container is then placed 250g of iron at 150°C and 20g of ice at -10°C. Find the final temperature of the mixture.
Given:
mAl=205g
mH2O=300g
TAl1=TH2O1=20°C
mFe=250g
mice=20g
TFe=150°C
Tice=-10°C
Homework Equations
Since the heat gained by aluminum container, water, and ice is equal to heat lost by iron, then
QAl+QH2O+Qice=QFe
Q=mcΔT
The Attempt at a Solution
What is asked is the final temperature of mixture, Tmix. so,
QAl=(mAl)(cAl)(Tmix-TAl1)=(205g)(.21cal/g°C)(Tmix-20°C)=43.05Tmix-861
QH2O=(mH2O)(cH2O)(Tmix-TH2O1)=(300g)(1cal/g°C)(Tmix-20°C)=300Tmix-6000
Qice=(mice)(cice)(Tmix-Tice)+(mice)(Lf)=(20g)(.5cal/g°C)(Tmix-(-10°C))+(20g)(80cal/g)=10Tmix+100cal+1600cal
Lf is the latent heat of iceQFe=(mFe)(cFe)(TFe-Tmix)=(250g)(.11cal/g°C)(150°C-Tmix)=4125cal-27.5Tmix
Therefore,
(43.05Tmix-861cal)+(300Tmix-6000cal)+(10Tmix+100cal+1600cal)=4125cal-27.5Tmix
380.55Tmix=7564cal
Tmix=19.88°C
Is this correct? i think there's something wrong in my solution..