Keywords: Cabron-12, atomic mass, ratios,
C2 Topic 5: Quantitative Chemistry
Percentage mass
This topic looks at:
• RAM and RFM
• Empirical formula
• Calculating masses of reactants and products
How can you calculate the percentage mass of an element in a compound?
Calculate the percentage mass of oxygen in
What is the RAM of
What is the RFM of
1.
1.
Carbon
Water
2. Magensium
2. Carbon Dioxide
3. Pb
3. CaCO3
4. Potassium
4. Mg(OH)2
5. Neon
5. H2SO4
1. CO and 2. CO2
What is the empirical formula?
Work out the following empirical formulas below
1.Water, is a sample contains 0.6g of hydrogen and 4.8g of oxygen
How can you work out the yield?
What are the reasons for not achieving the expected yield?
2. Lithium carbonate, if a sample contains 2.8g of lithium and 2.4 g of carbon
and 9.6g of oxygen.
Keywords: Cabron-12, atomic mass, ratios,
C2 Topic 5: Quantitative Chemistry
Calculating Reactants and Products
This topic looks at:
• RAM and RFM
• Empirical formula
• Calculating masses of reactants and products
1. a. What is the theoretical yield that could be obtained from 256g of sulfur dioxide.
2SO2 + O2  2SO3
Name 3 products made in the petrochemical industry
1.
2.
3.
b. The actual yield of sulfur trioxide produced is 202g. Calculate the percentage yield.
Why is it expensive to dispose of waste products?
2. a. Iron is extracted from iron oxide by reducing with carbon
Fe2O3 + 3CO  2Fe + 3CO2
Using ideas about waste products explain why people
would object to a proposal to build a new factory to
manufacture plastics near to their home?
Calculate the theoretical yield of iron that could be obtained from 320 g of iron oxide.
b. The actual yield of iron produced is 89.6g. Calculate the percentage yield.