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August 22, 2014

Homework Help: CHEMISTRY

Posted by imstupid on Wednesday, June 26, 2013 at 1:59am.

During an experiment, a student adds 1.23 g of CaO to 200.0 mL of 0.500 M HCl. The student observes a temperature increase of 5.10 C. Assuming the solution\'s final volume is 200.0 mL, the density if 1.00 g/mL, and the heat capacity is 4.184 J/(gC), calculate the heat of the reaction, ΔHrxn.i know i need to use the equations q=mcdeltaT 
and delta H= q/n but i keep getting the wrong answer. also which one is the limiting reactant in the equation CaO(s) +2H+(aq)-->Ca^2+(aq)+H2(g)

MY WORK

Q=10*4.184*5.1=213.384
delta H=213.384/1.23=173.483

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