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QUESTION

# What does the R stand for in the ideal gas law (PV=nRT)?

The units of constant is derived from equation pV = nRT?

Where the pressure p is in atmospheres (atm), the volume V is in liters (L), the moles n is in moles (mol) and temperature T is in Kelvin (K) as in most gas law calculations.

R is the Ideal Gas Law constant and is derived through algebraic reconfiguration we end up with Pressure and Volume being decided by moles and Temperature, giving us a combined unit of (atm xx L) / (mol xx K). the constant value then becomes 0.0821 (atm(L))/(mol(K))

If you choose not to have your students work in standard pressure unit factor, you may also use: 8.31 (kPa(L))/(mol(K)) or 62.4 (Torr(L))/(mol(K)).

Temperature must always be in Kelvin (K) to avoid using 0 C and getting no solution when students divide.

There is a variation of the ideal gas law that uses the of the gas with the equation PM = dRT

Where M is the Molar Mass in g/(mol) and d is the Density of the gas in g/L.

Pressure and Temperature must remain in the units atm and K and the Gas Law Constant remains R = 0.0821 ((atm) L) / ((mol) K).

I hope this is helpful. SMARTERTEACHER

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