Chemistry 2002 JAMB Past Questions - Question 50: If 0.75 mole of cyclopropane and 0.66 mole of oxygen are mixed in a vessel with a total pressure of 0.7 atmosphere, what is the partial pressure of oxygen in the mixture?

Correct Answer

D

Explanation

To find the partial pressure of oxygen in the mixture, we can use the mole fractions of the gases. First, we need to find the total moles of gas in the mixture:

Total moles of gas = moles of cyclopropane + moles of oxygen
Total moles of gas = 0.75 moles + 0.66 moles
Total moles of gas = 1.41 moles

Next, we can find the mole fraction of oxygen:

Mole fraction of oxygen = moles of oxygen / total moles of gas
Mole fraction of oxygen = 0.66 moles / 1.41 moles
Mole fraction of oxygen ≈ 0.4681

Now, we can find the partial pressure of oxygen:

Partial pressure of oxygen = mole fraction of oxygen × total pressure
Partial pressure of oxygen = 0.4681 × 0.7 atm
Partial pressure of oxygen ≈ 0.3277 atm

Therefore, the partial pressure of oxygen in the mixture is approximately 0.3277 atmospheres.