If the pressure, volume, and the number of moles of a gas are known, which is needed to calculate the universal gas constant from the ideal gas law?

a) the temperature of the gas

b) the molar volume of the gas

c) the molar mass of the gas

d) the partial pressure of the gas

The ideal gas law is a thermodynamic equation which relates the state defining parameters such as pressure (P), volume (V), temperature (T) and number of moles (n) of a gas.

It is based on two major assumptions:

i) the volume occupied by the gas molecules is negligible when compared to the total volume of the gas and

ii) there is no intermolecular force of attraction between the gas particles

Mathematically it is given by:

PV = nRT

where R is the universal gas constant

R = PV/nT

Thus, if P,V and n are known then the temperature (T) of the gas is required to calculate R

Ans: A)

clouds form

solid ice forms on leaves.

water droplets form on grass.