This question is about the unnecessary production of carbon dioxide

Question

Outdoor flames, such as patio heaters and the Olympic flame, contribute to global warming. This is not only due to the heat released, but also due to the carbon dioxide produced from the
combustion of hydrocarbons. Most patio heaters are powered by small cylinders of propane gas. A typical patio heater designed to produce 15 kW of energy runs from a cylinder containing 13 kg of propane. A ‘completely full’ cylinder at a pressure of 140 psi (9.52 atmospheres) is in fact only filled to about 87% capacity with liquid propane, the remaining volume being taken up by propane vapour. The standard enthalpy change of combustion of propane is –2220 kJ mol–1.

Assume 1 mole of a gas occupies 24 dm3 under the conditions of this question.

i) Calculate the number of moles of propane contained in a cylinder.
ii) Calculate the mass of carbon dioxide produced when all of the propane in a cylinder
is burnt completely.
iii) Calculate the total amount of heat energy released by combustion of all the propane
in a cylinder.

Answer 1

i. Convert 13,000 grams Propane (C3H8) to moles

ii. write the balanced equation
2C3H8+ 10O2 >>> 6CO2 + 8H2O
so the moles you had in i, you should have twice that number of moles of carbon dioxide. Convert that to mass.

iii. for each moles in i, multiply by 2220kj

Answer 2

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