2.1.3 amount of substance

Question 1

what is the unit for the amount of substance n?

Answer 1

mole

Question 2

what is Avogadro constant?

Answer 2

the number of atoms per mole of the carbon-12 isotope

6.02 x 10²³ mol ⁻¹

Question 3

what is molar mass?

Answer 3

the mass per mole of a substance, in units - g mol ⁻¹

Question 4

equation that links amount of substance, mass and molar mass

Answer 4

amount n = mass m / molar mass M

Question 5

what is molecular formula?

Answer 5

the number and type of atoms of each element in a molecule

Question 6

what is empirical formula?

Answer 6

the simplest whole number ratio of atoms of each element present in a compound

Question 7

what is relative molecular mass?

Answer 7

compares the mass of a molecule with the mass of an atom of carbon-12

Question 8

what is the relative formula mass?

Answer 8

compares the mass of a formula unit with the mass of an atom of carbon-12

Question 9

what is water of crystallisation?

Answer 9

water molecules that are bonded into a crystalline structure of a compound