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 oxygen gas is consumed by the reaction of 1.89 g of octane? Be sure your answer has the correct number of significant digits.

Answer 1

Combustion reaction: 2C,H,8 + 250, +1600, +18H,0 Mass of C,H, is 1.89g Molar mass of CH, is 114.23_8 mol mole Number of moles of C,H,8 =1.89gx. 114.23 g =0.0165mole 25moleo, Number of moles of O, consumed = 0.0165mole C,H,g x= 18 “2 moleC H18 =0.207 moleo, 32.0 g Mass of the O, consumed =0.207 mole 0, x= = 6.62 g mole02