[alwar4033]

Hi friends,

1. By Avogrado law we can tell 1 mole of any gas will occupy 22.7 litres
2. We know that universal gas constant is 8.314 Kj/mol-K

Which of these was first derived and kindly tell how?

[Borek]

By Avogrado law we can tell 1 mole of any gas will occupy 22.7 litres

That's not exactly true - it works this way only at STP.

We know that universal gas constant is 8.314 Kj/mol-K

Which of these was first derived and kindly tell how?

Both things are measured, not derived, and it is actually the same experiment.

[alwar4033]

Can you tell in detail about the experiment...

[Borek]

Take a gas sample, measure number of moles of gas, pressure, volume and temperature at the same time. Plug them all into the ideal gas equation - the only unknown is R.

That's not to say it is the only way, but the most obvious one in the context of Avogadro's law.

[billnotgatez]

Using GOOGLE and WIKI might give you more insight
for instance
http://en.wikipedia.org/wiki/Gas_constant