Homework Help: chemistry

Posted by san on Thursday, November 1, 2012 at 1:43am.

Assume you are performing the calibration step of Experiment 8 and you begin with 70 g of water at 20 oC and 70 g of water at 80 oC. After adding the two portions of water into your calorimeter setup and following the procedure outlined in the experiment, you determine the temperature of the mixed portions of water to be 45 oC. What is the heat capacity of the calorimeter?

chemistry - DrBob222, Thursday, November 1, 2012 at 1:52pm
I don't know what experiment 8 is nor do I know the procedure. However, if I know the temperature of the calorimeter initially I can help you. Perhaps the experiment started with 70 g H2O at 20 C. Let me make that assumption and you can correct me if I'm wrong.
[mass cool H2O x specific heat x (Tf-Ti)] + [mass warm H2O x specific heat x (Tf-Ti)] + Ccal(Tf-Ti) = 0
Substitute 70 for mass cool and mass warm water, specific heat, and Tf and Ti. Solve for Ccal.

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