What is the ideal gas constant R value?

The ideal gas constant, commonly denoted as R, is a fundamental constant used in the ideal gas law equation ( PV = nRT ). This equation relates the pressure (P), volume (V), number of moles (n), and temperature (T) of an ideal gas.

The value that is universally accepted and most frequently used in various calculations involving the ideal gas law is approximately 0.0821 L·atm/(K·mol). This specific formulation of R is particularly useful because it allows for calculations involving pressure in atmospheres and volume in liters at a given temperature in Kelvin.

Understanding that R has different values depending on the units used is crucial. For example, while the value of 8.314 is also correct, it is typically expressed in different units, such as Joules per mole per Kelvin or in L·kPa/(K·mol) when using other unit systems. The answer B is correct as it aligns with the commonly used value of R in the context of the ideal gas law when pressure is measured in atmospheres and volume in liters, facilitating practical applications in laboratory and engineering settings.