Multiple Choice
Which statement best describes the process of combustion in terms of energy change?
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3. Chemical Reactions
Combustion Analysis
Multiple Choice
Which of the following are the products of the complete combustion of propane (C_3H_8)?
A
C and H_2O
B
CO_2 and O_2
C
CO and H_2O
D
CO_2 and H_2O
Verified step by step guidance1
Recall that complete combustion of a hydrocarbon involves reacting the hydrocarbon with oxygen (O_2) to produce carbon dioxide (CO_2) and water (H_2O).
Write the general equation for the complete combustion of propane (C_3H_8): \(\mathrm{C_3H_8 + O_2 \rightarrow CO_2 + H_2O}\).
Balance the carbon atoms by ensuring the number of CO_2 molecules equals the number of carbon atoms in propane: since propane has 3 carbons, write \(3\,\mathrm{CO_2}\) on the product side.
Balance the hydrogen atoms by ensuring the number of H_2O molecules corresponds to the hydrogen atoms in propane: propane has 8 hydrogens, so write \(4\,\mathrm{H_2O}\) on the product side (because each water molecule has 2 hydrogens).
Balance the oxygen atoms by adjusting the O_2 molecules on the reactant side so that the total oxygen atoms on both sides are equal, considering the oxygen atoms in both CO_2 and H_2O.
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