Question

The number of moles of CO$_2$ produced when 2 moles of C$_2$H$_6$ are completely burnt is:

• A. 4
• B. 8
• C. 12
• D. 6

Hint:

Always balance the combustion reaction to find correct mole ratios of reactants and products.

Answer 1

The Correct Option is A

To determine the moles of CO₂ produced from the complete combustion of 2 moles of C₂H₆, the balanced chemical equation for ethane combustion is required.

The balanced equation is:

2 C₂H₆ + 7 O₂ → 4 CO₂ + 6 H₂O

This equation indicates that 2 moles of C₂H₆ yield 4 moles of CO₂ upon complete combustion.

Using stoichiometry based on the balanced equation, with 2 moles of C₂H₆ as the starting reactant:

• The molar ratio of C₂H₆ to CO₂ is 2:4, simplifying to 1:2.
• Consequently, 2 moles of C₂H₆ will produce \(2 \times 2 = 4\) moles of CO₂.

Therefore, 4 moles of CO₂ are produced.