Astack gas (before scrubbing, that is, before removing so2) has the following composition by mass: 6% so2, 22% o2, 72% n2. what are the mole fractions of each species in the stack gas?

Explanation:

Assume you have 100 g of the stack gas. Calculate the mass of each species in this sample according their percentages.

mass of sulphur : 6% of 100 g = 6 g

mass of oxygen : 22% of 100 g = 22 g

mass of nitrogen : 72% of 100 g = 72 g

Now calculate the number of moles of each species

number of moles of sulphur :

number of moles of oxygen:

number of moles of nitrogen:

Now to calculate the mol fraction of each we use the formula:

mol fraction of A =

Therefore

mole fraction of sulphur =

mole fraction of oxygen =

mole fraction of nitrogen =