Empirical Formula Calculations 1
1.
17.03g of magnesium was completely combusted in air to produce 28.25g of magnesium oxide. What is the
empirical formula of magnesium oxide? What is the chemical formula of magnesium oxide?
2. 12.04g of calcium was completely combusted in air to produce 16.86g of calcium oxide. What is the empirical
formula of calcium oxide? What is the chemical formula of calcium oxide?
3. 11.01g of lithium was completely combusted in air to produce 23.70g of lithium oxide. What is the empirical
formula of lithium oxide? What is the chemical formula of lithium oxide?
4. A compound was decomposed to produce 13.45L of hydrogen gas (H2) measured at 25oC and 100kPa and 13.43L
of (O2) measured at 25oC and 100kPa. What is the empirical formula of the compound? Suggest what the
compound could be.
5. Caffeine has an elemental analysis of 49.48% carbon, 5.190% hydrogen, 28.85% nitrogen and 16.47% oxygen by
mass. Determine the empirical formula of caffeine. Determine the chemical formula of caffeine if its molecular
weight is 194.2 g/mol.
6. NutraSweet has an elemental analysis of 57.14% carbon, 6.16% hydrogen, 9.52% nitrogen and 27.18% oxygen by
mass. Determine the empirical formula of NutraSweet. Determine the chemical formula of NutraSweet if its
molecular weight is 294.3 g/mol.
7. 5.00g of a compound of nitrogen and hydrogen was combusted to produce 3.638L of nitrogen gas (N2) measured
at 25oC and 100kPa and some water. What is the empirical formula of the compound? Suggest what the
compound could be.
8. 25.00g of a compound of nitrogen and hydrogen was combusted to produce 6.190L of nitrogen gas (N2)
measured at 25oC and 100kPa and some water. What is the empirical formula of the compound? Suggest what
the compound could be.
9. An alkyne is completely combusted in air to produce 19.83L of carbon dioxide and 14.87L of water vapour
measured at 25oC and 100kPa. What is the empirical formula of the alkyne? What is the name of the alkyne,
assuming it has one triple bond?
10. An alkane is completely combusted in air to produce 34.71L of carbon dioxide and 40.49L of water vapour
measured at 25oC and 100kPa. What is the empirical formula of the alkane? What is the name of the alkane,
assuming it is a straight chain alkane?
11. A hydrocarbon fuel is completely combusted in air to produce 53.03L of carbon dioxide measured at 25oC and
100kPa and 38.55g of water. What is the empirical formula of the hydrocarbon? Is it a straight chain alkane,
alkene or alkyne?
12. An alkane is completely combusted in air to produce 29.21L of carbon dioxide and 43.82L of water vapour
measured at 25oC and 100kPa. What is the empirical formula of the alkane? What is the name of the alkane,
assuming it is a straight chain alkane?