Question

Please help me with the enthalpy of combustion of a metal

1)Mg+2HCl-> MgCl2+H2
2)MgO+2HCl->MgCl2+H2O
3)2Mg+O2->2MgO

I need to find the experimental enthalpy of combustion in kJ and the theoretical enthalpy of it.

Answer 1

You need to find the individual enthalpies. You should be given or so.

Answer 2

@primeralph it was not given :(...

Answer 3

Well, maybe you should use standard values. Google the enthalpies.

Answer 4

@primeralph it says i need to use the Hess's law??

Answer 5

Yeah, but you'll need numbers to plug in.

Answer 6

find the enthalpies of formation for each compound (elements in their pure, most stable form are zero so you can just ignore Mg and O2)