Question

write down the values of r in two different units​

Answer 1

Answer:

Value of R (gas constant) has many values depending on the unit system: Generally by Ideal Gas ... Values of gas constant in different units are as follows ... If yes, what are the cases ?

Answer 2

Answer:

Value of R (gas constant) has many values depending on the unit system:

Generally by Ideal Gas Equation

R=PV/nT where P is pressure, V is volume, n is the number of moles of gas, T is temperature. (let this be equation 1)

At S.T.P (Standard Temperature and Pressure)

P= 1 atm, T=273K (kelvin) or 0° Celsius, taking n as 1 and so the volume of gas is 22.4 lit (gram molar volume), by calculations in equation 1, R=0.0821 lit.atm/mol.kel

In C.G.S system, n and T remains same(no unit change), P=1 atm = 10^5×101325 dyn/m^2, V= 22400ml, then by equation 1, R=8.314×10^7 ergs/Mol. kel

In M.K.S system P=101325N/m^2 and V=22.4×10^-3 m^3 so R is 8.314J/Mol.kel

Just a simple conversion from Joules to Calories (1 cal= 4.18J)

R=1.98Cal/mol.kel