When should we use R (gas constant) value as 8.31. . and as 0.0821? I'm confused

can you please help sir / mam

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Solution

R (the gas constant) :
According to the equation PV=nRT,
when the temperature is in kelvin, pressure is in pascals and volume is in metre cube, then use gas constant,
R = 8.314 $m^{3} . P a . K^{- 1} m o l^{- 1}$
when pressure is given in atmosphere, volume in litres and temp is in kelvin, then use gas constant,
R =0.0821 $L . a t m . m o l^{- 1} K^{- 1}$

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When should we use R (gas constant) value as 8.31. . and as 0.0821? I'm confused can you please help sir / mam

When should we use R (gas constant) value as 8.31. . and as 0.0821? I'm confused

can you please help sir / mam