- #1
crazyog
- 50
- 0
Homework Statement
25 kg of ice at 0C is combined with 4 kg of steam at 100C. What is the final equilibrium temperature in Celsius of the system? (Lf = 3.33x 10^5 J/kg; Lv= 2.26x10^6 J/kg; 1 cal= 4.186 J) Answer: 20
Homework Equations
mc(Tf- Ti)
m(Lf) or m (Li)
The Attempt at a Solution
I thought you should do an equation for both parts so:
m= mass c = specific heat T= temperature
mc(Tf-Ti) + m(lf) +mc(Tf-i)=0
25(2090)(Tf-0) + 25(3.33x10^6) + 25(4186)(Tf-0) = 0
then...
mc(Tf-Ti) + m(Lv) +mc(Tf-i)=0
4(2010)(Tf-100)+ 4(2.26x 10^6) + 4(4186)(Tf-100) = 0
however I used these equation and solved for Tf in both and added them together to get a final answer and the answer was not 20.
please help! thanks in advanced.