Combustion Analysis Problems (Challenge)
1. You should be able to set up and solve chemical analysis of an unknown compound by
combustion problems.
7.321 g of an organic compound containing carbon, hydrogen, and oxygen was analyzed
by combustion. The amount of carbon dioxide produced was 17.873 g and the amount of
water produced was 7.316 g. Determine the empirical formula of the compound.
2. 0.1101 grams of an organic compound containing carbon, hydrogen, and oxygen was
analyzed by combustion. The amount of carbon dioxide produced was 0.2503 grams and
the amount of water produced was 0.1025 grams. A determination of the molar mass of
the compound indicated a value of approximately 115 grams/mol. Determine the
empirical formula and the molecular formula of the compound.
3. 2.012 g of a metal carbonate, MCO3, is heated to give the metal oxide and 0.855 g
CO2.
MCO3 (s)  MO (s) + CO2 (g)
What is the identity of the metal?