###### Asked in Chemistry

Chemistry

# What is R in the ideal gas equation and what is the value of it?

## Answer

###### Wiki User

###### May 13, 2012 5:34AM

R is the gas constant. The value depends on what units you're using. It's 8.314 J per mole Kelvin (approximately, but four significant figures is almost certainly enough considering that real gasses aren't "ideal" anyway).

## Related Questions

###### Asked in Chemistry

### What is the value of the gas constant in the ideal gas law?

The Gas Constant (R) is the constant in the equation for the
Ideal Gas Law: PV = nRT
where P is pressure, V is volume, n is number of moles, and T is
temperature.
The value of the gas constant 'R' depends on the units used for
pressure, volume and temperature.
R = 0.0821 liter·atm/mol·K
R = 8.3145 J/mol·K
R = 8.2057 m3·atm/mol·K
R = 62.3637 L·Torr/mol·K or L·mmHg/mol·K

###### Asked in Chemistry

### What is the Ideal Gas Law?

The Ideal Gas Law is the equation of state of a hypothetical
ideal gas.
The state of an amount of gas is determined by its pressure,
volume and temperature. The modern form of the equation is:
pV = nRT
where p is the absolute pressure of the gas; V is the volume; n
is the amount of the substance; R is the gas constant; and T is the
absolute temperature.
apex- a law describing the properties of a gas
PV = nRT

###### Asked in Chemistry

### How R in ideal gas law become 62.4?

According to the ideal gas law, PV = nRT, where P is pressure, V
is volume, n is moles (mol), T is temperature, and R is the gas
constant. If you know everything except R, solve it by manipulating
the equation as follows: R = PV/nT. The value of the gas constant R
depends on the units used for pressure, volume and temperature. At
a pressure of 760 Torr or 760 mmHg, and a temperature of 273.15K,
one mole of an ideal gas will have a volume of 22.41L. If we plug
these values into the modified ideal gas equation and solve for R,
we get the following: R = (760 Torr x 22.41L)/(1mol x 273.15K),
which equals 62.35 Lâ€¢Torr/molâ€¢K. Since 760 Torr equals 760
mmHg, we can substitute mmHg for Torr, and the value for R will be
62.35 Lâ€¢mmHg/molâ€¢K. For some reason scientists put the unit for
volume first and the unit for pressure second when writing out the
units for R, even though the equation has them reversed. It makes
absolutely no difference since multiplication of units as well as
numbers is commutative.

###### Asked in Chemistry, Numbers , Mathematical Constants

### What is characteristic gas constant?

"Characteristic Gas
Constant"
The constant 'R' used in the characteristic gas equation PV=RT ,
has a constant value for a particular gas and is called
'Characteristic gas constant' or 'specific gas constant' . Its
value depend upon the temperature scale used and the properties of
the gas, under consideration.
The value of R will be.
For atmospheric pressure air,
R= 287 J/kg/k

###### Asked in Chemistry, Numbers , Mathematical Constants

### What constant is equal to the ratio ofthe gas constant to the avogadro constant?

The gas constant (R) makes both sides of the ideal gas equation
(PV=nRT) equal. It is therefore called the proportionality constant
in the ideal gas equation. The value of R is 8.314 J/mol˚K. If you
divide the ideal gas constant by Avogadro's number you get
R/NA=(8.314 J mol-1 K-1)/(6.022x1023 #of atoms mol-1)=1.38x10-23
J/(atoms x K) since the mol-1 terms cancel out. This value is the
Boltzman constant (kb) usually expressed in units of J/K
(energy/temperature) and it gives the average energy of a single
atom or molecule at an absolute temperature T. Just multiply kb by
T and you get energy in Joules.

###### Asked in Physics, Chemical Bonding

### How is the ideal gas law equation 'PV equals nRT' derived?

The ideal gas law, PV = nRT, is based on the fact that pressure
is proportional to both the number of gas moles present and the
temperature, but inversely proportional to volume. By rearranging
the variables and finding the constant for the equation
(represented by R) through experiment, we can establish the above
relationship.

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