Unit #1Unit #2Unit #3Unit #4Unit #5Unit #6Unit #7Unit #8Unit #9Unit #10
spacerUNIT # 7  
spacerspacerIntroduction
spacerspacerObjectives
spacerspacerReading

spacer7.1 Calculation of
spacerFormula
spacerMass

spacer7.2 Mole
spacerConcept

spacer7.3 Atomic Mass
spacerRevisited

spacer7.4 Calculation of
spacerMolar Mass
spacer
7.5 Calculations
spacerinvolving
spacerAvogadro #

spacerMass to mole conversion and vice-versa
spacermole to number of particles conversion and vice-versa
spacerMass in grams to number of particles conversion
spacer
7.6 Molar Volume
spacerof a Gas
spacerMolar volume calculations
spacer
7.7 Percent
spacerComposition
spacer
7.8 Empirical
spacerFormula

spacer7.9 Empirical
spacerMass to
spacerMolecular
spacerFormula



spacerProblems
spacer1 | 2
| 3 | 4 | 5

Unit #7CALCULATIONS 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 gases

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.

Take a look at the "special" number, "22.4".

The molar volume of any gas at STP is 22.4 L.

Section 8.3
Molar Volume of a Gas and Related Calculations ..p195


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