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May 6, 2016

Homework Help: Chemistry

Posted by Ali on Sunday, June 17, 2012 at 1:35pm.

In the following experiment, a coffee-cup calorimeter containing 100 \rm mL of \rm H_2O is used. The initial temperature of the calorimeter is 23.0 \rm ^{\circ}C. If 9.80 g of \rm CaCl_2 is added to the calorimeter, what will be the final temperature of the solution in the calorimeter? The heat of solution \Delta H_{\rm soln} of \rm CaCl_2 is \rm -82.8~kJ/mol.
• Chemistry - DrBob222, Sunday, June 17, 2012 at 2:34pm

The heat added to the calorimeter was 82,800 J x (9.80/110.98) = ?
? = mass H2O x specific heat H2O x (Tfinal-Tinitial) = 0
Substitute and solve for Tf.

• Chemistry - LOL, Thursday, January 17, 2013 at 7:54am

Err.. Dr Bob do we add the mass of CaCl2 with H2O? when we want to find m