Author Question: What is the mean free path for the molecules in an ideal gas when the pressure is 100 kPa and the ... (Read 21 times)

penguins · **on:** Jul 29, 2018

What is the mean free path for the molecules in an ideal gas when the pressure is 100 kPa and the temperature is 300 K given

that the collision cross-section for the molecules of that gas is 2.0 10-20 m2? Boltzmann's constant is k = 1.38 10-23 J/K.
A)

1.1 10-6 m

B)

2.1 10-6 m

C)

1.7 10-6 m

D)

5.3 10-6 m

E)

1.5 10-6 m

Question 2

Luminous (normal) matter makes up approximately what percentage of the known matter in the universe?

A) 15 B) 5 C) 60 D) 95