Question

How molecules of CO2 (g) are produced when 0.75 moles of propane are burned? Chemical reaction: C3H8 + 5O2 à 3CO2 + 4H2O

moles C3H8 consumed = 0.75 mol

moles CO2 produced = (moles C3H8 consumed) * (mole ratio of CO2 to C3H8)

moles CO2 produced = (0.75 mol) * (3 mol CO2 / 1 mol C3H8)

moles CO2 produced = (0.75 mol) * (3)

moles CO2 produced = 2.25 mol

molecules CO2 produced = (moles CO2 produced) * (Avogadro's number)

molecules CO2 produced = (2.25 mol) * (6.022 x 1023 molecules/mol)

molecules CO2 produced = 1.355 x 1024 molecules

molecules CO2 produced = 1.4 x 1024 molecules        (correct number of significant figures)

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