Mole concept

Question 1

1 mol = ______

Answer 1

6x10²³

Question 2

mole

mass in grams (actual mass)

Answer 2

mol x Mr = mass in grams

Question 3

mole

number of molecules

Answer 3

mol x (6 x 10²³) = number of molecules/atoms…

Question 4

mole

volume of gases

Answer 4

1 mol = 24 dm³

1dm³ = 1000cm³
1 dm³ = 1L

Question 5

mole

concentration

Answer 5

mol/dm³
g/dm³

mol/dm³ x Mr = g/dm³

M₁V₁ / M₂V₂ = mole ratio

Question 6

mole

percentage

Answer 6

(Mr of element etc / Mr of whole compund) x 100% = ____ %

Question 7

mole

finding mass in grams using %

Answer 7

(Mr of element etc / Mr of compound) x (Mass of compound in grams) = mass of element in grams

Question 8

mole
empirical formula
molecular formula

Answer 8

table

1. element
2. mass/g or mass/%
3. number of moles
4. mole ratio (using smallest value to divide) – take 3/4sf
5. simplest ratio in whole numbers

Molecular formula
Mr of empirical formula x constant = Mr of molecular formula in qn

(empircal formula)꜀ₒₙₛₜₐₙₜ = molecular formula