C4H10 is commonly used as a fuel in liquefied petroleum gas (LPG). Sometimes it is also mixed with C3H8 depending on the application of the fuel. Consider the combustion of C4H10 with theoretical amount of dry air. The air-fuel ratio is 20. Evaluate: i) the reaction equation of the combustion process, ii) the percentage of excess air, iii) the volume percentage of CO2 in the products, and iv) the dew point temperature of the products based on appropriate assumption.