A gallon of gasoline has a mass of about 2700-g. Presume that the gasoline is composed of octane, C8H18, and the only emission products are carbon dioxide and water. How much carbon dioxide does the average car produce in a year? The average car uses 1 gallon of gas in 20 miles and travels about 12,000 miles in a year.

answer: the value of enthalpy change will be -152.80 kj.

solution:

pressure = 1atm , temperature = = 298 k

given that pressure and temperature are same in both gases , the number of moles of both gases can be determined by the ideal gas equation.

according to reaction 3 moles no are reacting with 1 mol of ,then 0.49 mol of no will react with moles of ozone that is 0.16 moles of ozone. since, no is limiting reagent and is an excessive reagent.

enthalpy change for the reaction between the given volumes of the gases is :

the answer is na (sodium)