Question

There is a standard value of temperature and pressure at which the molar volume of a gas is $22.4{\text{L}}$. The correct values are:
A.$273{\text{K, 1atm}}$
B.$300{\text{K, 760mm}}$
C.${273^o}{\text{C, 760mm}}$
D.$373{\text{K, 1atm}}$

Answer 1

To answer this question, you should recall the concept of standard conditions of gas properties. The values in the equation $PV = nRT$ have been defined at STP, i.e. standard temperature and pressure.

Complete answer:
There are few conditions in chemistry which are used in different experiments and calculations and they are STP i.e. standard temperature pressure and other one is NTP i.e. Normal temperature pressure and the parameters of temperature and pressure are already defined for these and by using these parameters we can easily calculate the value of volume of gas i.e. molar volume. The standard condition for the gas volume to be $22.4{\text{L}}$ is when temperature is $273{\text{K}}$ and pressure is ${\text{1atm}}$.

Hence, the correct option is option (A).

Note: Make sure you remember that at conditions of high temperature and lower pressure, a real gas behaves like an ideal gas, because the potential energy due to intermolecular attractive forces becomes less significant compared with the particles’ kinetic energy, and the size of the molecules becomes less significant compared to the space between them. The five gas laws are:
1.Boyle’s Law establishes a relationship between the pressure and the volume of a gas.
2.Charles’s Law establishes a relationship between the volume occupied by a gas and the absolute temperature.
3.Gay-Lussac’s Law establishes a relationship between the pressure exerted by a gas on the walls of its container and the absolute temperature associated with the gas.
4.Avogadro’s Law establishes a relationship between the volume occupied by a gas and the amount of gaseous substance.
5.After combining these four aforementioned laws we arrive at the Combined Gas Law