C4 Equations

Question 1

How do you find the mass of a component in a chemical reaction

Answer 1

Balance equation
Mark your ? and ✅
Find the number of mols for ✅ ( mass / Mr)
Use the equation to work out the ratio between ? and ✅ and find out what the mols of ? should be
Use mass = mols x Mr to find mass

Question 2

Equation to find moles

Answer 2

Moles = mass/Mr

Question 3

What is the volume of 1 mole of ANY gas

Answer 3

24dm^3

Question 4

How to find the number of moles of a gas

Answer 4

No of moles = volume ( dm^3 ) / 24dm^3

Question 5

How do you find concentration

Answer 5

Conc ( mol/dm^3) = moles of solute / volume cm^3 x 1000

Conc ( mol/dm^3 ) = moles of solute / volume dm^3

Question 6

How do you calculate g/dm^3

Answer 6

Conc (mol/dm^3 ) x Mr

Question 7

What is 1 dm^3 equal to

Answer 7

1cm^3 x 1000

Question 8

How do you calculate the percentage yield

Answer 8

Actual mass / maximum theoretical mass - x 100

Question 9

How do you calculate maximum theoretical mass

Answer 9

Balance equation
Mark your ? and ✅
Find the number of mols for ✅ ( mass / Mr)
Use the equation to work out the ratio between ? and ✅ and find out what the mols of ? should be
Use mass = mols x Mr to find maximum theoretical mass

Question 10

Equation for atom economy

Answer 10

Relative formula mass for desired product / sum of Mr for reactants - x100 ( use the big numbers to multiply Mr )

Question 11

Method for a titration

Answer 11

Clean, dry pipette, transfer 25cm3 of alkali to conical flask
Add a few drops of indicator to alkali
Fill a clean dry burette with acid
Note starting volume
Add acod into conical flask and swirl
When indicator starts to change, add acid dropwise and swirl
When colour change lasts 10 secs, stop adding acid, not new volume
Calculate titre and repeat until 2 concordant results are obtained