Chapter 1.2

Question 1

Relative atomic mass Ar

Answer 1

The average of the masses of the isotopes in a naturally occurring sample of the element relative to the mass of 1/12 of an atom of carbon-12

Question 2

Relative molecular mass Mr

Answer 2

The mass of a molecule of that compound relative to the mass of 1/12 of an atom of carbon-12

Question 3

Relative formula mass

Answer 3

The mass of one formula unit relative to the mass of 1/12 of an atom of carbon-12

Question 4

Value of Avogadro’s constant

Answer 4

6.02 x 10^23

Question 5

Equation linking mass of one molecule with molar mass and Avogadro’s constant

Answer 5

Mass of one molecule = molar mass divided by Avogadro’s constant

Question 6

% by mass of an element

Answer 6

Number of atoms of the element multiplied by relative atomic mass divided by relative molecular mass

Question 7

Empirical formula

Answer 7

The simplest whole number ratio of the elements present in a compound

Question 8

Molecular formula

Answer 8

The total number of atoms of each element present in a molecule of the compound