Hi A-Level Chemistry students.

Today, we will discuss on the topic of **IDEAL GAS LAW**, which might be known as **THE GASEOUS STATE** in your Chemistry syllabus.

Now, in Singapore *GCE A-Level H2 Chemistry syllabus*, candidates are required to know the following:

1) Basic assumptions of the kinetic theory as applied to an ideal gas

2) Conditions necessary for a gas to approach ideal behavior

3) Limitations of Ideality at very high pressures and very low temperatures

4) General gas equation pV=nRT and the determination of M_{r}

In the prevIous blog posts, we have discussed on point 1, 2 and 3. You can do a search for those posts by keying in “*Ideal Gas Law*” on the top RHS field.

Today we will go through the general gas equation which is:

**pV=nRT**

which can be expressed as

**pV=(m/M _{r})RT **since n = m / M

_{r}

It is important to note the units to be used in each term in the equation. Examiners’ reports have always identified *wrong use of units* to be one of the *most common error in A-Level exams*.

p = pressure in Pa or N/m^{2}

V = volume … Continue reading ...