two monatomic gases, helium and neon,are mixed and in thermal quilibrium at T. t

Question

two monatomic gases, helium and neon,are mixed and in thermal quilibrium at T. therefore,

1)
a)the helium atoms have thesame average traslational kinetic energy as the meon atoms.

b) each atom has a different average translational KE.

c) there is a difference of 3/2 kT in the average translational KE between helium atoms and meon atoms.

2) if the molar mass of helium is 4.0g/mol and the molarass of neon is 20.2g/mol, then,

a) all the atoms have exactly same velocity.
b) all the atoms have same average speed
c) the average speed of the helium atoms is greater
d) the average speed of neon atoms is greater
e) the atoms diffuse from high temperature to low temperature.

Explanation / Answer

1)

Both are monoatomic and have the same temperature since they are in thermal equilibrium.

As such they will have the same traslational kinetic energy because it is dependent on absolute temperature only. Thus:

Ans: a)the helium atoms have thesame average traslational kinetic energy as the neon atoms.

2)

Speed is inversely proportional to molar mass. So

Ans: c) the average speed of the helium atoms is greater

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