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Concentration and moles for AQA A-level Chemistry

This page covers the following topics:

1. Moles

Avogadro's constant: 1 mole = 6.02 x 10²³ atoms/molecules/protons. To convert from moles to atoms (or reverse) use Avogadro's constant. Moles can also be calculated by using the pyramid (mass = moles x RFM).

1

How many moles is 4.515 × 10²³ atoms of a substance?

n = N/Nₐ = 4.515 × 10²³ ÷ (6.02 × 10²³) = 0.75 mol

0.75 mol

How many moles is 4.515 × 10²³ atoms of a substance?

2

What is the moles of 2g of calcium carbonate (CaCO₃)?

2 / 100 = 0.02 mol

3

What is a mole?

1 mol = 6.02 × 10²³

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4

Calculate the number of particles in 2 mol of a substance?

2 * 6.02 x 10²³ = 1.204 x 10²⁴

5

Calculate the number of particles in 0.5 mol of a substance?

0.5 * 6.02 x 10²³ = 3.01 x 10²³

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