This is an incomplete question, here is a complete question.
The gaseous mixture contains 1 mol of methane, 3 mol of carbon dioxide, and 1 mole of hydrogen sulfide. The total pressure in the room 1 atm. What are the mole fractions and partial pressures of the gases?
Answer :
The mole fraction of
and
gases are, 0.2, 0.6 and 0.2 respectively.
The partial pressure of
and
gases are, 0.2, 0.6 and 0.2 atm respectively.
Explanation : Given,
Moles of
= 1 mole
Moles of
= 3 mole
Moles of
= 1 mole
Now we have to calculate the mole fraction of
and
gases.


and,


and,


Thus, the mole fraction of
and
gases are, 0.2, 0.6 and 0.2 respectively.
Now we have to calculate the partial pressure of
and
gases.
According to the Raoult's law,

where,
= partial pressure of gas
= total pressure of gas = 1 atm
= mole fraction of gas


and,


and,


Thus, the partial pressure of
and
gases are, 0.2, 0.6 and 0.2 atm respectively.