BASED ON FORMULAE 7.6 - Molar
Volume of a Gas
The volume of a gas is sensitive to both pressure
and temperature. Because a gas is easily compressible,
by adjusting the pressure and temperature of a gas sample, I can alter the volume
that the gas sample occupies. Therefore, if the volumes of any two gas samples
are to be compared, they must be under the same conditions (ie - the two gas
samples MUST be at the same temperature and pressure).
A common set of conditions that is often used by scientists
is called StandardTemperature
and Pressure or STP. When the STP condition is implied,
scientists know that the gas must be at a specific temperature
and a specific pressure.
Click to find out the specific temperature and
pressure conditions at STP.
Let's take a look at Gas densities at STP.
In section 1.8 we
learned about density of solids, liquids and gases. In this unit, we will focus
on learning about densities
of gases at STP.
Click below to see the densities of a few common
For any gas at STP, when the molar
mass of the gas is divided by the density of the gas, the value "22.4"
is always obtained.