Posted by **James** on Friday, February 8, 2008 at 7:55pm.

In a calorimetry experiment in the lab, you were able to record the following data:

Mass of water in a calorimeter = 90.0 g

Initial temperature of water in calorimeter = 22.0o C

Mass of unknown metal = 45.0 g

Initial temperature of hot metal = 100.0o C

Final temperature of water after you place hot metal in calorimeter filled with water = 28.0o C

Based on the above data, what is the Cp of the metal?

(Cp H2O = 4.184 J/g oC)

- chemistry -
**DrBob222**, Friday, February 8, 2008 at 8:01pm
q = massmetal x Cpmetal x delta Tmetal.

q = massH2O x CpH2O x delta TH2O.

Use equation 2 first to calculate q, then use equation 1 (using q from the first calculation) to calculate Cp metal. Post your work if you get stuck.

- chemistry -
**DrBob222**, Friday, February 8, 2008 at 8:20pm
Cp for H2O is given in the problem. Last line in your post.

Use equation 2 first. You know mass H2O, you know Cp H2O, and you know delta T. Calculate q. Plug that q into equation 1. Now you have q, mass metal, and delta T metal. Calculate Cp metal.

- chemistry -
**DrBob222**, Friday, February 8, 2008 at 8:58pm
sounds ok. I suppose that's J/g

- chemistry -
**James**, Friday, February 8, 2008 at 9:01pm
Thanks alot Dr.Bob!

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