Physics Help Forum Final Temperature of mercury

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 May 1st 2011, 12:18 PM #1 Junior Member   Join Date: Mar 2011 Posts: 25 Final Temperature of mercury I am stumped as to how to properly solve the second part of the following problem. I was able to solve the first part, but am in need of assistance for part "b". Thanks!! here is part a: How much heat is required to raise the temperature of 0.250 of water from 20.0 to 30.0? Using the formula Q = m * specific heat of water * delta T = .250 * 4.19E3 *10 Q = 10475 J part b is as follows: If this amount of heat is added to an equal mass of mercury that is initially at 20.0, what is its final temperature? Here is what I did: Q = .250 * 18e-5* (change in T) Q = 4.5e-5 (T(final) - 20) 10475 = 4.5e-5 * T final - .0009 T final = 2.33e8 which was incorrect Am i using the wrong equation? Thanks again!
May 1st 2011, 12:44 PM   #2

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 Originally Posted by pre pt marc I am stumped as to how to properly solve the second part of the following problem. I was able to solve the first part, but am in need of assistance for part "b". Thanks!! here is part a: How much heat is required to raise the temperature of 0.250 of water from 20.0 to 30.0? Using the formula Q = m * specific heat of water * delta T = .250 * 4.19E3 *10 Q = 10475 J part b is as follows: If this amount of heat is added to an equal mass of mercury that is initially at 20.0, what is its final temperature? Here is what I did: Q = .250 * 18e-5* (change in T) Q = 4.5e-5 (T(final) - 20) 10475 = 4.5e-5 * T final - .0009 T final = 2.33e8 which was incorrect Am i using the wrong equation? Thanks again!
Haven't I already suggested you use units on your numbers? If I haven't then please do so.

Your specific heat for Mercury is waaaaaay off. See here.

-Dan
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