A major component of gasoline is octane . When octane is burned in air, it chemi

Question

A major component of gasoline is octane . When octane is burned in air, it chemically reacts with oxygen gas to produce carbon dioxide and water . What mass of octane is consumed by the reaction of of oxygen gas?

Explanation / Answer

Step 1) balance rxn 2C8H18 + 25O2 => 16CO2 + 18H2O Note: numbers in front of compound are coefficients and other numbers are subscript Step 2) Stoich Molar mass O2 = 32g/mol Molar mass Octane = 114.23g/mol 8.41g O2 *(1mol O2 / 32g O2)*(2mol C8H18/ 25mol O2)*(114.23g C8H18/ 1mol C8H18) = 2.40168575g C8H18 Also I am assuming that O2 is the limiting react which means that it will be fully consumed in reaction

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