solving a chemical reaction

Question

We did not find results for: major component of gasoline is octane (C8H18). When octane is burned in air it chemically reacts with oxygen (O2) to produce carbon dioxide (CO2) and water (H2O). What mass of oxygen gas is consumed by the reaction of 8.17g of octane?.

Answer 1

First, start with the balanced equation.

This is a combustion reaction

 

2C8H18 + 25O2 --> 16CO2 + 18H2O

 

Molar mass of octane = 114.23 g/mol

Molar mass of O2 = 32.00 g/mol

 

Convert grams to moles then multiply by the molar ratio

 

8.17g C8H18 x (1 mol C8H18/114.23 g) x (25 mol O2 / 2 mol C8H18) x (32.00 g O2/1 mol O2) = 28.61 g O2