Question
A mixture of 0.5 mol N _2 gas, 1.0 mol O _2 gas and 1.5 mol H _2 gas exerts a total pressure of 18 bar. Find the partial pressure of O _ 2(g) .
MHT CET
Chemistry
States of Matter
2026
MHT CET 2026 (20 April Shift 2)
MHT CET Chemistry Question (2026) — Solution
Options
- A. 4.0 bar
- B. 6.0 bar
- C. 8.0 bar
- D. 10.0 bar
Answer
B. 6.0 bar
Step-by-step solution
Total number of moles in the mixture is: n_ total = n_ N_2 + n_ O_2 + n_ H_2 n_ total = 0.5 + 1.0 + 1.5 = 3.0 mol Mole fraction of O _2 is: x_ O_2 = n_ O_2 n_ total = 1.0 3.0 = 1 3 According to Dalton's law of partial pressures, the partial pressure of O _2 is: P_ O_2 = x_ O_2 P_ total P_ O_2 = 1 3 18 = 6.0 bar Answer: 6.0 bar
Related: Chemistry — States of Matter · All PYQ Banks