Question

There are 3 non-interacting ideal gases in a container. The moles of gases 1,2 & 3 are in the ratio 1:3:5. If the total pressure is 54Pa, find the value of partial pressure of gas 1.

(a) 6Pa

(b) 12Pa

(c) 18Pa

(d) 28Pa

I had been asked this question in an interview for job.

The doubt is from Kinetic Theory topic in section Kinetic Theory of Physics – Class 11

Answer 1

The correct choice is (a) 6Pa

The best explanation: The ratio of partial pressures will be in the same ratio as that of moles, i.e: 1:3:5.

Let the partial pressure of gas 1 be ‘x’.

Thus, x+3x+5x = 54.

x = 6Pa.