When to use 3/2RT vs 3/2nRT

[Rucap09]

I understand how the KE of a gas can be 1/2mv^2 = 3/2RT, but was wondering when 3/2RT vs 3/2nRT is used.

Am I right in thinking that 3/2nRT is used for calculating total KE of a system, whereas 3/2RT is avg kinetic energy? Are there any example questions that utilize one vs the other to show what context you'd look for?

Lastly, how do you get from 3/2RT to 3/2kT?

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[dudewheresmymd]

3/2 nRT is the average KE per mole of gas.

3/2kT is the avg ke of each gas molecule.

http://www.dummies.com/how-to/content/calculating-kinetic-energy-in-an-ideal-gas.html