Question

What is the most probable speed of oxygen gas with the mass of 32 grams at 27-degree centigrade?

(a) 33.74 m/s

(b) 44.78 m/s

(c) 57.94 m/s

(d) 549.14 m/s

The question was asked by my school teacher while I was bunking the class.

Origin of the question is States of Matter in chapter States of Matter of Chemistry – Class 11

Answer 1

Right answer is (b) 44.78 m/s

Explanation: The formula for the most probable speed of a gas is given as \(\sqrt{8RT/πM}\). Here R is a universal gas constant which is always equal to 8.314 kgm^2s^-2, T=300 Kelvin and M = 0.032 kg So by substituting, we get an answer as 44.78 m/s.