Formulas

Question 1

% Yield

Answer 1

% Yield = mass of product actually made x 100
maximum theoretical mass of product

Question 2

No of particles (atoms, molecules and ions.)

Answer 2

No of particles = number of moles x Avogadro’s constant

Question 3

Percentage atom economy

Answer 3

Percentage atom economy = Mr of the desired product x 100
Sum of Mr of all reactants

Question 4

Percentage atom economy definition

Answer 4

The atom economy is a measure of the amount of starting materials that end up as useful products

Question 5

The volume of one mole of any gas at room temperature

Answer 5

The volume of one mole of any gas at room temperature (200C and pressure (1 atmosphere pressure) is 24 dm3 = 24000cm3.

Question 6

Gas Volume (dm3)

Answer 6

Gas Volume (dm3)= moles x 24

Question 7

Concentration of a solution

Answer 7

Concentration of a solution (g/dm3) = mass (g) / volume of solvent (dm3)

Question 8

% Mass of an element in a compound

Answer 8

Number of atoms of that element / Mr of the compound

Question 9

Number of moles

Answer 9

Mass in g / Mr