Figure 2 shows the displayed equation for the complete combustion of propane. Figure 2
Η Η Η
30=CEO + 4H-0-H
H-C-C-C-H + 50=0
| |
H Η Η
The table below shows bond energies.
Bond
Bond energy in kJ/mol
C-C
347
C-H
413
O=0
495
C=0
799
O-H
467
Calculate the overall energy change in kJ/mol for the reaction.

the law of conservation of mass states that in a chemical reaction, the total mass of reactants is equal to the total mass of products. because atoms are only rearranged in a chemical reaction, there must be the same number of sodium atoms and chlorine atoms in both the reactants and products

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