Amount of substance

Question 1

Concentration

Answer 1

moles of solute dissolved per 1 dm3 of solution

Question 2

Molar mass

Answer 2

mass in grams per mole of a substance

Question 3

Molar volume

Answer 3

volume that 1 mole of a gas occupies at room temperature and pressure (24dm3)

Question 4

Relative atomic mass

Answer 4

weighted mean mass of an atom
compared with 1/12 of the mass of an atom of carbon-12

Question 5

Relative formula mass

Answer 5

weighted mean mass of a formula unit compared with 1/12 of the mass of an atom of carbon-12

Question 6

Relative isotopic mass

Answer 6

mass of an ATOMof an ISOTOPE compared with 1/12 of the mass of an atom of carbon-12

Question 7

Relative molecular mass

Answer 7

weighted mean mass of a MOLECULE compared with 1/12 of the mass of an atom of carbon-12

Question 8

Standard solution

Answer 8

solution of known concentration

Question 9

Stoichiometry

Answer 9

molar relationship between the
substances involved in a chemical reaction

Question 10

The Avogadro Constant (NA)

Answer 10

number of atoms per mole of the carbon-12 isotope
(6.02 x 10 23 mol -1)