s1.4 the mole

Question 1

what is a mole?

Answer 1

the mole, symbol mol, is the SI unit for amount of substance (n). it is a measure of the number of specified elementary entities. one mole contains exactly 6.02 x10²³ elementary entities - this is numerically equal to the avogadro constant (L or Nₐ)

Question 2

what is the equation linking number of entities and avogadro’s constant?

Answer 2

number of entities (M) = number of moles (n) x avogadro’s constant (Nₐ)

Question 3

what is relative formula mass?

Answer 3

relative formula mass, Mr, is the weighted average mass of a substance relative to 1/12 the mass of an atom of carbon-12