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Question

Consider the combustion reaction for octane (C8H18),(C8H18), which is a primary component of gasoline.

2C8H18+25O2⟶16CO2+18H2O2C8H18+25O2⟶16CO2+18H2O

How many moles of CO2CO2 are emitted into the atmosphere when 27.6 g C8H1827.6 g C8H18 is burned?

Answer 1

2C₈H₁₈ + 25 O₂ ==> 16CO₂ + 18H₂O ... balanced equation

molar mass C₈H₁₈ = 114.2 g / mol

moles C₈H₁₈ = 27.6 g x 1 mol / 114.2 g = 0.242 mol

moles CO₂ produced = 0.242 mol C₈H₁₈ x 16 mol CO₂ / 2 mol C8H18 = 1.94 mol CO₂