Topic: Mass and Mole Fractions

Problem Statement:

Ambient air moves into and out of buildings on a daily basis. Environmental engineers design air

systems to remove pollutants from the atmosphere such as filters and cyclones. This homework

examines mass and mole composition of air in the building.

$1.)$ Problem Setup: Draw a flow diagram of the problem you are being asked to solve, clearly labeling all

variables.

Air moving into a building is composed of $70\%N_2$ by mass, and $0\mathrm{.}1\%S{O}_2.$ Air leaving the building is

composed of $15\%$ by mole $O_2$ and $9\mathrm{.}6\%$ by mole $C{O}_2.$ You can assume that air coming in has the same

composition of air coming out of the building. Draw a flow diagram with a stream of air coming into the

building and a stream of air leaving the building. Label the composition of air in each stream based on

the information presented above. Use variables $($such as $m,n,$ etc.$)$ to label each stream into the system

and subscripts to denote each species.

$2.)$ Solve: Solve the problem statement using your process flow diagram from part $(1),$

Using the information from part $(1),$ fill in the rest of this table to fully describe the mass and molar

composition of the air moving through the building.