Calculations

Question 1

Percentage Yield

Answer 1

Actual yield / Theoretical yield x 100

Question 2

Atom economy

Answer 2

Total Formula mass of products
Divided by
Total Formula mass of all reactants

X 100

Question 3

Concentrations

Answer 3

Concentration in Mol(dm^-3) =
Amount of solute in mol
————————————–
Volume in dm^3

Question 4

Avagadros law

Answer 4

Equal volumes of different gases contain an equal number of molecules

Question 5

Molar volume

Answer 5

24,000 cm^3 or 24 dm^3

Question 6

Calculating the amount of gas

Answer 6

Amount in mol = volume
—————
Molar volume

Question 7

Amount of given mass substance

Answer 7

Amount in mol = mass in g
—————–
Mr

Question 8

Limiting reactants

Answer 8

A reactant that is all used up, it stops the chemical reaction when it finishes.

Question 9

Reacting mass calculation

Answer 9

The balanced equation - get the mass of the limiiting reactant, and then the relative Ar or Mr values of the limiting reactant and the product.