Calculations

View mindmap

Empirical Formmula
- Calculations
  - Calculating the percentage of an element within a compound
    - Eg. Percentage of carbon in CO2
      - Divide the R.A.M. of the element by the R.F.M. of the compound and times by 100
      - 1) Carbon R.A.M=12 2)CO2 R.F.M = 12(16x2)=44 3)12 / 44 x100 = 27.3%
  - Yield of Reaction
    - How much product is made compared with the maximum amount that could be
      - Eg. 2Mg + O2 =2MgO and 2.3g of MgO was collcted from 2.0g og Mg
    - Using reactions with high yields in industry helps reduces waste and conserve resources such as oil, for energy so there is less pollution
      - Not usually is all potential product is collected much is lost when collected or other reactions occur
    - Percentage Yield= Amount of product collected / Maximum amount of product possible x100
- The simplest ration of the atoms/ions in a compound
- Each elements R.A.M. is divided by the given percentage, and then divided again by the smallest number from the last sum
  - Eg. Empirical formula of compound with 80% Carbon and 20% Hyrdogen
Calculating Masses from equations
- We can use Balanced equations to calculate masses of reactants and products in a reaction
- Eg. 2Mg + O2 = 2MgO With 5g of Mg how much mass of MgO will be produced

Similar Chemistry resources:

See all Chemistry resources »

See all Atoms resources »

Comments