Given the following information regarding bond strength, estimate the heat evolv

Question

Given the following information regarding bond strength, estimate the heat evolved when the 1.0lb of propane undergoes combustion. INCLUDE UNITS and INCLUDE THE SIGN C-H: 413 kJ/mole C=O: 745 kJ/mole O=O: 498 kJ/mole H-O: 467 kJ/mole C-C: 347 kJ/mol Given the following information regarding bond strength, estimate the heat evolved when the 1.0lb of propane undergoes combustion. INCLUDE UNITS and INCLUDE THE SIGN C-H: 413 kJ/mole C=O: 745 kJ/mole O=O: 498 kJ/mole H-O: 467 kJ/mole C-C: 347 kJ/mol Given the following information regarding bond strength, estimate the heat evolved when the 1.0lb of propane undergoes combustion. INCLUDE UNITS and INCLUDE THE SIGN C-H: 413 kJ/mole C=O: 745 kJ/mole O=O: 498 kJ/mole H-O: 467 kJ/mole C-C: 347 kJ/mol

Explanation / Answer

Given the following information regarding bond strength, estimate the heat evolved when the 1.0lb of propane undergoes combustion. INCLUDE UNITS and INCLUDE THE SIGN

C-H: 413 kJ/mole

C=O: 745 kJ/mole

O=O: 498 kJ/mole

H-O: 467 kJ/mole

C-C: 347 kJ/mol

C3H8 + 5O2 = 3CO2 + 4H2O

Net energy gained = (6 C=O + 8 O-H) - (2 C-C + 8 C-H + 5 O=O)

= (6x745 + 8x467) - (2x347 + 8x413+ 5x498) = 1718 kJ/mole of fuel

since three moles of CO2 are produced for each mole of C3H8 burned, burning propane will release 677 kJ/mole of CO2 released.

The molar mass of propane is 44 g/mole, so burning propane will release (1718kJ/mole) / (44g/mole) = about 46 kJ/g of fuel burned.

1.0lb of propane =453.592 grams of propane

Number of Moles of propane =453.592 grams /44.1 g/mol=10.28 moles

One mole of propane

Gives

1718 kJ/mole of fuel heat

10.28 moles of propane

1718 x 10.28 =17661.04kJ/mole of fuel heat—answer

One mole of propane

Gives

1718 kJ/mole of fuel heat

10.28 moles of propane

1718 x 10.28 =17661.04kJ/mole of fuel heat—answer

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