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### Topic: What will be the change in temperature of the water?  (Read 3704 times)

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#### khemkhajon

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##### What will be the change in temperature of the water?
« on: September 08, 2009, 10:41:13 PM »
1. The problem statement, all variables and given/known data
A 500.0-g iron bar at 212 C is placed in 2.0 L of water at 24.0 C. What will be the change in temperature of the water ( Assume no heat is lost to the surroundings.)

2. Relevant equations
(Mass of substance)(Specific Heat of substance)( Change in Temp)

3. The attempt at a solution

I am having alot of trouble with this problem. I don't fully understand how I use that forumula to find the change? I know the answer is 5 C. But I don't understand how. I was wondering if someone could explain how you come about to get this answer using the formulas cause this would be very helpful? Do I have to convert anything or what? So confused.

#### MrTeo

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##### Re: What will be the change in temperature of the water?
« Reply #1 on: September 09, 2009, 01:05:37 AM »
Start from these two facts: the heat given by the bar is the same of the heat received by water and at the end of the process there is thermical equilibrium (both metal and water have the same temperatures).
The way of the superior man may be compared to what takes place in traveling, when to go to a distance we must first traverse the space that is near, and in ascending a height, when we must begin from the lower ground. (Confucius)

#### khemkhajon

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##### Re: What will be the change in temperature of the water?
« Reply #2 on: September 09, 2009, 07:58:24 PM »
Start from these two facts: the heat given by the bar is the same of the heat received by water and at the end of the process there is thermical equilibrium (both metal and water have the same temperatures).

Im still confused ? So does that mean that I subtract the two temperatures.

#### MrTeo

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##### Re: What will be the change in temperature of the water?
« Reply #3 on: September 10, 2009, 03:28:40 AM »
Well, you wrote "change in temperature" and this simply means to put tmetal-tequilibrium and tequilibrium-twater in your equation. Using this fact you can equal the heat given by metal and taken by water.
The way of the superior man may be compared to what takes place in traveling, when to go to a distance we must first traverse the space that is near, and in ascending a height, when we must begin from the lower ground. (Confucius)