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.

answer: the value of enthalpy change will be -152.80 kj.

solution:

pressure = 1atm , temperature = = 298 k

given that pressure and temperature are same in both gases , the number of moles of both gases can be determined by the ideal gas equation.

according to reaction 3 moles no are reacting with 1 mol of ,then 0.49 mol of no will react with moles of ozone that is 0.16 moles of ozone. since, no is limiting reagent and is an excessive reagent.

enthalpy change for the reaction between the given volumes of the gases is :

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