Calculate amounts using particle number and the Avogadro constant.

In the subtopic The mole and the Avogadro constant, this AQA A-Level Chemistry 7405 learning objective focuses on calculate amounts using particle number and the Avogadro constant. It belongs to Amount of substance, so revision should stay anchored to this exact subtopic rather than drifting into a generic GCSE-level chemistry summary. Approved keywords to use include Avogadro constant. Particle number. means the total count of individual particles, such as atoms or molecules, in a sample Avoid the mistake of students often forget to convert the particle number to moles using the Avogadro constant before performing calculations; instead, to fix this, remember the formula: n = N / L, where n is the number of moles, N is the number of particles, and L is the Avogadro constant (6.022 x 10^23 mol^-1). For example, if you have 1.2044 x 10^24 particles, substitute: n = 1.2044 x 10^24 / 6.022 x 10^23 = 2.00 moles For exam answers, to find the number of moles from a given number of particles, use the formula: n = N / L, where n is the number of moles, N is the number of particles, and L is Avogadro's constant (6.022 x 10^23 mol^-1)