객관식
When fossil fuels, which are primarily hydrocarbons, are burned during combustion analysis, what substance do they react with?
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3. Chemical Reactions
Combustion Analysis
객관식
Which of the following are the main products formed during the complete combustion of ethane (C_2H_6)?
A
CO and H_2O
B
CH_4 and O_2
C
C and H_2O
D
CO_2 and H_2O
검증된 단계별 안내1
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) as the main products.
Write the general form of the complete combustion reaction for ethane (C_2H_6):
\[ C_2H_6 + O_2 \rightarrow CO_2 + H_2O \]
Balance the carbon atoms by ensuring the number of CO_2 molecules equals the number of carbon atoms in ethane (which is 2):
\[ C_2H_6 + O_2 \rightarrow 2CO_2 + H_2O \]
Balance the hydrogen atoms by ensuring the number of H_2O molecules corresponds to the hydrogen atoms in ethane (6 hydrogens means 3 water molecules):
\[ C_2H_6 + O_2 \rightarrow 2CO_2 + 3H_2O \]
Finally, balance the oxygen atoms by adjusting the O_2 molecules on the reactant side. Count the oxygen atoms on the product side (2×2 from CO_2 plus 3×1 from H_2O) and divide by 2 to find the O_2 coefficient.
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