Formulae, equations and moles

Question 1

Molecular formula

Answer 1

Shows the number of atoms of each element in one molecule of the substance

Question 2

Molar mass

Answer 2

The mass of 1 mol of a substance. The units are g mol^-1

Question 3

Empirical formula

Answer 3

The simplest whole number ratio of the atoms of each element in the substance

Question 4

Mole

Answer 4

The amount of substance containing the Avogadro constant number of atoms, molecules or groups of ions

Question 5

Calculation for moles of solid

Answer 5

Moles = mass/molar mass

Question 6

How to calculate number of molecules from moles

Answer 6

Number of molecules = moles x Avogadro constant