b. If the furnace is not properly adjusted, the products of combustion can include other gases, such as CO and unburned hydrocarbons. If only 269.34g of CO2 were formed in the above reaction, what would the percent yield be? ( 2 points) b. If the furnace is not properly adjusted, the products of combustion can include other gases, such as CO and unburned hydrocarbons. If only 269.34g of CO2 were formed in the above reaction, what would the percent yield be? ( 2 points)