Question

A mixture of hydrocarbons contains 34.8% heptane, C7H16, 10.1% nonane, C9H20, and 55.1% octane, C8H18. The mixture is combusted in an excess of oxygen. What mass of CO2 is generated from the combustion of 17.0 kg
of the mixture?
:

Answer 1

Mass of CO₂ generated from the combustion : 14.277 kg

Further explanation

Mass Heptane : 0.348 x 17 = 5.916 kg

mass C in Heptane (MW=100.21 g/mol) :

$\tt \dfrac{7.12}{100.21}\times 5.916=4.959~kg$

Mass Nonane : 0.101 x 17 = 1.717 kg

mass C in Nonane (MW=128.2 g/mol) :

$\tt \dfrac{9.12}{128.2}\times 1.717=1.446~kg$

Mass Octane : 0.551 x 17 = 9.367 kg

mass C in Otane (MW=114.23 g/mol) :

$\tt \dfrac{8.12}{114.23}\times 9.367=7.872~kg$

Total mass produced :

4.959+1.446+7.872=14.277 kg