Amounts of Substance 2.1.3

Question 1

Define Mole.

Answer 1

The amount of substance which contains the same number of atoms (or ions or molecules) as there are atoms in 12g of carbon-12

Question 2

What is Avagadro’s Constant?

Answer 2

The number of atoms (or ions or molecules) in one mole of a substance

Question 3

What is Molar Mass?

Answer 3

The mass of a substance that conatains one mole of that substance

Question 4

What is Molar Gas Volume?

Answer 4

The number of moles of gas in 1dm^3

Question 5

What is Molecular Formula?

Answer 5

The actual number of atoms present in each molecule

Question 6

What is Empirical Formula?

Answer 6

The simplest ratio of the number of atoms of each element present in the molecule

Question 7

What equation links Mass, Relative Formula Mass and Number of Moles?

Answer 7

Moles = Mass/Relative Formula Mass
Mol = mass/Mr

Question 8

What equation links Number of Moles, Volume and 24dm^3 ?

Answer 8

Moles = Volume/24dm^3
Mol = vol/24dm^3

Question 9

What equation links Concentration, Volume and Number of Moles?

Answer 9

Moles = Concentration x Volume
Mol = con x vol

Question 10

What is Mass Concentration the same as?

Answer 10

Density

Mass/Volume

Question 11

How do you convert from cm^3 → dm^3 ?

Answer 11

cm^3 / 1000 = dm^3