n mole of an ideal gas at temperature T (in Kelvin) occupy V litres of volume, exerting a pressure of P atmospheres. What is its concentration (in mole.lit)? (R $=$ gas constant)

P/RT

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PT/R

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RT/P

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R/PT

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Solution

The correct option is A P/RT
Moles per litre measures concentration C of solution.
$C = \frac{n}{V} = \frac{P}{R T}$

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