Problem 1 (10 pts)

Assume that coal has a sulfur content of 3% by weight. If all the sulfur is converted into SO2

during the combustion process, (a) how much SO₂ is produced per tonne of coal? (b) How much

is produced per megajoule of energy produced?

The molecular mass of sulfur is 32 gram mole. Sulfur content in 1 tonne of coal is given (or may

be found from what's given); you need to find out the content of SO2 when I tonne of coal is

burned. So, find out the ratio (of molar mass) of S in SO2; from here you can determine the SO₂

content./nProblem 2 (10 pts)

A typical gasoline-powered vehicle requires about 3.7 MJ of primary energy (i.e., energy content

of the gasoline) to travel 1 km. How many kilograms of CO2 are produced annually by a vehicle

that is driven 40,000 km per year?

From the energy content of gasoline (octane), you may find out the amount (kg) of gasoline

required to drive the vehicle annually.

The chemical reaction for burning octane is given by:

2C8H18 + 250216CO2 + 18H20

From here, you can find out how many grams of octane yields what amount of CO2, which may

then be used to find the total CO2 produced.