Wednesday
November 26, 2014

Homework Help: Chemistry

Posted by Anonymous on Monday, February 25, 2008 at 1:01pm.

When 0.655 g of Ca metal is added to 200.0 mL of 0.500 M HCl(aq), a temperature increase of 107C 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 ______ kJ/mol.

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I used q=m*s*DeltaT
q=(200)(4.184)(10.7)
For mols, I got 0.0163.
I multiplied the two & got it wrong. I don't know what to do from there.

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