Homework Help: chemistry

Posted by Kelly on Sunday, February 21, 2010 at 3:22pm.

When 0.767 g of Ca metal is added to 200.0 mL of 0.500 M HCl(aq), a temperature increase of 125C 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.)
The molar heat of reaction, H rxn, for the reaction of

Ca(s) + 2H+(aq) Ca2+(aq) + H2(g)

is.....

chemistry - DrBob222, Sunday, February 21, 2010 at 4:22pm
q = mass water x specific heat water x delta T
q/0.767 = J/g
Convert to kJ/mol.
chemistry - Scared Chem Student, Monday, February 22, 2010 at 4:10am
I did what you said and it didn't work Dr Bob. Can you explain step by step?

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