Atoms & compounds, Amount of substance

Question 1

Relative Isotopic Mass

Answer 1

Mass of an atom of an isotope compared to 1/12th of the mass of an atom of Carbon-12

Question 2

Relative atomic mass

Answer 2

The weighted mean mass of an atom compared to 1/12th of the mass of an atom of Carbon-12

Question 3

Mass spectroscopy and isotopes

Answer 3

No of peaks: Number of isotopes

(Mass x abundance)+ (mass x abundance) / 100

Question 4

Mole

Answer 4

The amount of substance containing as many particles as there are carbon atoms in 12 grams of carbon 12 isotope.

Question 5

Avagadro’s constant

Answer 5

The no. of particles in 1 mole of an atom
6.02 x 10^23

Question 6

Molar mass

Answer 6

Mass of 1 mole of a substance and is given the unit of g mol-1

Question 7

Molar gas volume

Answer 7

Gas volume in 1 mole of substance.

Question 8

Empirical formula

Answer 8

The smallest whole number ratio of atoms of each element in a compound

Question 9

Molecular formula

Answer 9

The number and type of atoms of each element in a molecule.

Question 10

Hydrated

Answer 10

Crystalline compound containing H2O molecules

Question 11

Anhydrous

Answer 11

Not containing H2O molecules

Question 12

Theoretical yield

Answer 12

The maximum amount of product that can be made in a reaction