What is a mole?
A mole is a unit of measurement for the amount of a substance. One mole is 6.02 x 10^23 particles in a substance, known as Avogadro's constant. This is because this is the number of atoms in 12g of Carbon- 12(the relative atomic mass of the carbon atoms). The molar mass is always equal to the atomic mass of an atom, for example 1 mole of oxygen is equal to 16 grams.
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Related Chemistry A Level answers
All answers ▸State and explain the trend in ionisation energies and its effect on the reactivity of groups containing metals.
Explain the position and numbering system of elements on the periodic table.
By comparing the forces involved, explain why hydrogen iodide (HI) would have a higher boiling point than hydrogen bromide (HBr)?
Give reasons for the increase in ionisation energy across a period in the table of elements.