A0.5 mole sample of he(g) and a .5 mole sample of ne(g) are places separately in two 10.0 l rigid containers at 25 c. each container has a pinhole opening. which of the gases, he or ne will escape faster through the pinhole and why?

Helium

Explanation:

Scottish physicist Thomas Graham formulated a law known as Graham's law of effusion in 1848. He conducted an experiment and found the relationship between the rate of effusion of a gas and its molar mass as:

where,  

r is the rate of effusion of a gas

M is the molar mass of the gas.

And for two gases taking different rate of effusion as r₁ and r₂ to effuse, the formula is:

Since, Helium has a lower molecular mass as compared to that  of neon. So, Helium will escape faster through the pinhole.