moles - Crunch Chemistry

Determining the limiting reactant in a reaction

Limiting reactant problems follow on directly from reacting mass calculations. In these questions, you have to figure out which reactant

Percentage yield is one of many deciding factors in determining whether or not a reaction is economically viable. It compares

The key to reacting mass calculations at A level is to have a foolproof method for setting them out so

Empirical formula: simplest ratio of the atoms of different elements in a compound Molecular formula: the actual number of each

Factor Name Unit Common examples 106 mega M 103 kilo k kg 10-1 deci d dm 10-2 centi c cm

Atom economy or percentage atom economy is simply a measure of how ‘green’ a chemical process is – it essentially

Rule 1: when adding or subtracting numbers, the answer should be quoted to the least number of decimal places in

Often students arrive at A level knowing how to calculate the number of moles of a substance but with a