Question

When 1.000 g of propane gas (C3H8) is burned at 25ºC and 1.00 atm, H2O (l)...

When 1.000 g of propane gas (C3H8) is burned at 25ºC and 1.00 atm, H2O (l) and CO2 (g) are formed with the evolution of 50.33 kJ of energy.

Substance

∆Hºf (kJ mol -1)

Sº (J mol -1 K -1)

H2O (l)

- 285.8

69.95

CO2 (g)

- 393.5

213.7

O2 (g)

0.0

205.0

C3H8 (g)

?

270.2

Calculate the molar enthalpy of combustion, ∆Hºcomb , of propane and the standard molar enthalpy of formation, ∆Hºf , of propane gas.
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Homework Answers

Answer #1

The combustion reaction of propane is given by:

C3H8 (g) + 5O2 (g) → 3CO2 (g) + 4H2O (l)

No. of moles of Propane = Mass/Molar Mass

                                    = 1/44 = 0.023 mole

Molar Enthalpy of Combustion of propane,

Standard Molar Enthalpy of Formation of propane =

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