Formulas (NEED TO KNOW)

Question 1

How do you get the No. of Moles (n) from mass (m) and Molar Mass (M)

Answer 1

n = m/M
n in mol
m in g
M doesn’t have units

Question 2

What is Avogadro’s constant?

Answer 2

6.02 × 10²³

Question 3

1.How do you get the Number of atoms from number of moles (n) and Avogadro’s constant?

2.If its the amount of atoms in a
molecule you are trying to find out what else must you do?

Answer 3

1.number of atoms = n x avs constant

2. Multiply by the amount of atoms in that formula
   (e.g NH3 has 4 atoms in the formula)

Question 4

How do you work out Concentration (c) of a solution from Amount of Moles (n) and Volume (v)?

Answer 4

c = n/v

c in mol/dm3
n in mol
v in dm3