Let's assume a car owner fuels his/her car with pure octane (c8h18), how much co2 (in kg) goes into our atmosphere ? ( consider that an “average” person spends about $1000 per year on gasoline, and that gasoline currently costs on average $2.00 per gallon) show your work.
1 gallon of gas weighs 6 pounds.
1 kg is 2.2 pounds.

1000/2 = 500 gallons of C8H18         500*6 = 3000 pounds of C8H18          3000/2.2 = 1363.6363 ≈ 1364 kg of C8H18 = 1364000 g C8H18           C8H18 + O2 ---> 8CO2 + H2O   (ignore the incorrect coefficients for O2 and H2O I'm not bothered)             Mr of C8H18 = 114             1364000/114 ≈ 11965 mol C8H18          ≈11965*8(from equation) = 95719 mol CO2             Mr CO2 = 44            95719*44 = 4211649 g of CO2            4211649/1000 = 4211.65 kg CO2 

Woah that’s a lot to read xd i’ll try though. i’ll get back t you if. i know the andwer

☆ionisation energy increases across a period from na -> ar☆ionisation energy decreases down a group from li -> fr☆ionic radius decreases across a period from na -> cl☆ionic radius increases down a groupfrom f -> ii hope it clarifies your doubts