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May 23, 2015

Homework Help: Chemistry

Posted by Ashley on Saturday, April 30, 2011 at 1:57pm.

So I am writing a lab report and Im stuck with calculating the enthalpy change of combustion of the following reaction:
Mg+2HCl--> MgCl2+H2 .I am given the mass of Mg which is 5g and the concentration of HCl which is 2M and the volume of HCl which is 50 cm^3.I found the limiting reactant which was HCl and i have to measure the of combustion..I know that HE(HEAT ENERGY)=m x c x T and the change in temperature is 10 degrees celsius. I also know that in order to find H we divide HE with n which is the number of moles of the limiting reactant..can anyone please help me find the H?i DONT know whose mass to use, i know i have to use the heat capacity of water..and i dont know whether i have to convert temperature into Kelvin measurement.

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