Homework Help: chemistry

Posted by marcus on Wednesday, November 14, 2012 at 9:16pm.

When 50.0mL of 1.20 M of HCl (aq)is combined with 50.0mL of 1.30 M of NaOH (aq) in a coffee-cup calorimeter, the temperature of the solution increases by 8.01 Degrees C. What is the change in enthalpy for this balanced reaction?

HCl(aq) + NaOH(aq) --yields-- NaCl(aq) + H20(l)

Assume that the solution density is 1.00 g/mL and the specific heat capacity of the solution is 4.18 J/ g x Degrees C

chemistry - DrBob222, Wednesday, November 14, 2012 at 9:24pm
q = [mass H2O x specific heat H2O x (Tfinal-Tinitial)
Solve for q = delta H in joules.
Then delta H/0.06 mol = delta H in J/mol. Most of these are given in kJ/mol; I recommend you convert to kJ/mol.
chemistry - marcus, Thursday, November 15, 2012 at 12:24am
since q= 100 mL x 4.18 x 8.01
=3348.18/.06= 55803. J
to kJ= 55.803 should be the final answer, right? Because the answer key on my quiz says it's -55.8 kJ. I'm so confused because I thought for sure it would positive, especially since in the equation it says increases by 8.01, meaning it would be endothermic (+)? Am I missing something here?
chemistry - davan, Saturday, April 6, 2013 at 11:06pm
it's because the reaction is exothermic reaction so the answer should be negative, because in exothermic reaction the heat is released to the surrounding

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