Equations

Question 1

How to calculate concentration (titration questions)

Answer 1

Conc = m/ volume (dm3)

Question 2

How to calculate the volume in a gas

Answer 2

Volume = moles x 24dm3

Question 3

Ideal gas equation

Answer 3

Pv = nrt

Question 4

Conversion of Mol/dm3 into g/dm3

Answer 4

Multiply the mol/dm3 by the relative formula mass of the compound

Question 5

Why isnt the percentage yield always 100%

Answer 5

• not all of the reactant may react
• side reactions may take place making other products
• Our product may be lost e.g in filtration

Question 6

How to calculate percentage yield

Answer 6

Yield/ maximum theoretical yield x 100

Question 7

how to work out percentage uncertainty

Answer 7

uncertainty/ quantity measure x 1000

Question 8

in what cases do you multiply the uncertainty by 2

Answer 8

temperature change
mass change
change in volume with a burette

Question 9

unit for molar mass

Answer 9

g mol -1