Mole Calculations with Energy

Today we learned about mole calculations with energy.

This involves enthalpy, delta H. Delta H is expressed as a kJ/mole.

 To convert:
Moles to energy ----> 1kJ/mole

Energy to moles----> 1 mole/ 1 kJ


Here are some examples.

E.g.
CuO (s) + H2(g) + 135.0 kJ ----> Cu(s) + H2) (l)

Calculate energy absorbed for 6.0 moles of  CuO reacting.

130.5 kJ/mole x 6 moles = 780 kJ

Calculate the amount of energy released when 6.00 grams of Carbon are combined with O2 to form CO2 gas.

C(s) + O2(g) -----> CO2(g) + 393.5 kJ
First you convert grams to moles:

6.00g C (1 mole C/ 12.0107 g)

Then you multiply by (393.5 kJ/ 1mole C) and you get 196.57 kJ.

Piece of cake!


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