Heat can be obtained from the burning of many types of fossil fuels. One such re

Question

Heat can be obtained from the burning of many types of fossil fuels. One such reaction involves the combustion of propane gas (C3H8) which is used in gas fired grills.

- How many moles of propane are in a 2 kg (2000g) bottle of propane?

- How many grams of carbon dioxide are released by the complete combusion of the propane?

The chemical reaction is propane plus oxygen ---> carbon dioxide plus water. Be sure to write the balanced chemical equation.

Classify the type of reaction that is occuring when the propane is burned.

Explanation / Answer

The reaction is called combustion reaction

C3H8 + 5O2 ---> 3CO2 + 4H2O

Moles of propane = mass / Molar mass of propane

= 2000 g / 44.1 g/mol = 45.3515

CO2 moles = 3 x moles of C3H8 = 3 x 45.3515 = 136

CO2 mass produced = moles x molar mass of CO2

= 136 mol x 44 g/mol = 5986.4 g

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