Question

Calculate the mass concentrations of the following gaseous mixtures enclosed in a room at 2 atmospheres and 50 oC:

(a) Nitrogen (40% by mass), oxygen (40% by mass), and carbon dioxide (20% by mass) in the dry condition.

(b) Nitrogen (40% by mass), oxygen (40% by mass), and carbon dioxide (10% by mass), in the presence of 10% H2O by mass.

(c) Nitrogen (40%), oxygen (40% by mass), and carbon dioxide (5% by mass), in the presence of 15% H2O by mass.

(d) Nitrogen (50% by mass), oxygen (40% by mass), in the presence of 20% H2O by mass.

(e) Sketch a graph showing the relationship between %carbon dioxide on the x-axis, and mass concentration on the y-axis and sketch another plot between %water on the x- axis and mass concentration on the y-axis. Explain your plots by comparing the values in parts (a), (b), (c), and (d) and commenting on these value.

Answer 1

and total Volume of the mixture can be calculated by PV = nRT

Let the total mass of the mixture is 100 g and then by Mass % we can calculate the mass of that gas and then the number of moles of every gas can be calculated. and by this V cab be calculated.

Here the Mass % of N₂ and O₂ is constant and CO₂ and H₂O are varied .

A) Mass Concentration : 2.41 g/L ( when 20% CO₂ and 0% H₂O)

B) Mass Concentration : 2.18 g/L ( when 10% CO₂ and 10% H₂O)

C) Mass Concentration : 2.09 g/L ( when 5% CO₂ and 15% H₂O)

D) Mass Concentration : 1.99 g/L ( when 0% CO₂ and 20% H₂O)

E) Mass concentration decreases as the CO₂ mass % tends to zero and graph shows linear increase with increasing mass % CO₂

Mass concentration decreases when the mass % of H₂O increases and graph shows linear decrease with increasing mass % of H₂O .