More maths to master, I’m afraid 😕.
The good news is that in many ways, working with gases in Chemistry calculations is simplified because we know that the volume of space that a gas occupies depends on the temperature and pressure of that gas, not the number of molecules present (the molecules are so far apart from each other that their individual size or mass is irrelevant).
How to find the volume of gas in a reaction
Avogadro’s law is the basis for calculating the volume of gas produced in a reaction: equal volumes of gases at constant temperature and constant pressure contain the same number of molecules.
Finding the formula of a hydrocarbon from gas volumes
We can find the formula of a hydrocarbon if we know the volume of oxygen used and the volume of carbon dioxide produced in combustion of the hydrocarbon …
Finding the mass of a volatile liquid
We can use the ideal gas equation to find the molar mass (relative molecular mass) of a volatile liquid.
Understanding the ideal gas equation
The ideal gas equation is an amalgamation of Boyle’s law, Charles’s law and Avogadro’s law and it describes the behaviour of an ideal gas.
We can use it to calculate the volume or pressure or temperature of a fixed amount of gas, or to determine the effect of changing these conditions on the behaviour of a gas – essentially we are able to predict the behaviour of a gas under non-standard conditions.
Exam style questions for AS level
Every conceivable type of exam question covering all the gas calculations, from the straightforward to the fiendishly difficult.