Homework Help: chemistry lab

Posted by tweety on Monday, February 23, 2009 at 5:27pm.

When 0.969 g of CaO is added to 200.0 mL of 0.500 M HCl(aq), a temperature increase of 397C is observed.
Assume the solution's final volume is 200.0 mL, the density is 1.00 g/mL, and the heat capacity is 4.184 J/gC.
(Note: Pay attention to significant figures. Do not round until the final answer.)
Hrxn , for the reaction of

CaO(s) + 2H+(aq) Ca2+(aq) + H2O(l)

is kJ/mol.
please help it is due at 5

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