Mole Concept

Question 1

Relative atomic mass, Ar

Answer 1

• Average mass of one atom of the element as compared to 1/12 of the mass of one atom of carbon-12.

Question 2

Relative isotopic mass

Answer 2

• Mass of one atom of the isotope as compared to 1/12 of the mass of one atom of carbon-12.

Question 3

Relative molecular mass, Mr

Answer 3

• Average mass of one molecule of the substance as compared to 1/12 of the mass of one atom of carbon-12.

Question 4

Relative formula mass, Mr

Answer 4

Average mass of one formula unit of the substance as compared to 1/12 of the mass of one atom of carbon-12.

Question 5

Mole

Answer 5

One mole contains exactly 6.02 x 10^23 (or Avogadro’s constant) elementary entities.

Question 6

Empirical formula

Answer 6

• Shows the simplest whole number ratio for the atoms of different elements present in the compound.

Question 7

Molecular formula

Answer 7

• Shows the actual number of atoms of the different elements in one molecule of the compound.