IB Multiple Choice - Pure Substances

Test yourself on IB Multiple Choice - Pure Substances

• Use these percentage by masses to work out the organic compound’s empirical formula.

• Using the periodic table to help you, determine which sodium compound contains the highest mass percentage of sodium.

• Select the option that corresponds to a possible molecular formula for the hydrocarbon.

• Combustion of an alkane produces 3 moles of water and 2 moles of carbon dioxide. What is its empirical formula?

• A hydrocarbon undergoes complete combustion, with oxygen present, to produce CO₂ and water. On collecting the two products it was found that 2.20 g of CO₂ and 0.90 g of vapourised water were formed.
  
  Use the given information given to work out an empirical formula for the produced organic compound.