Empirical Formula Worksheet (circle answers)
1) A compound was analyzed and was found to contain the following percentages of the elements
by mass: barium 89.56%; oxygen 10.44%. Determine the empirical formula of the compound.
2) A compound was analyzed and was found to contain the following percentages of the elements
by mass: nitrogen 11.64%; chlorine 88.36%. Determine the empirical formula of the compound.
3) A 0.5998g sample of a new compound has been analyzed and found to contain the following
masses of elements: carbon 0.2322 g; hydrogen 0.05848 g; oxygen 0.3091 g. Calculate the
empirical formula for the compound.
4) A compound has been analyzed and found to contain the following percentages of the elements
by mass: boron 78.14% ; hydrogen 21.86%. Determine the empirical formula for the compound.
5) If a 1.271 g sample of aluminum metal is heated in a chlorine gas atmosphere, the mass of the
aluminum chloride produced is 6.280g. Calculate the empirical formula of aluminum chloride.
6) A compound was analyzed and was found to contain the following percentages of the elements
by mass: tin 45.56%, chlorine 54.43%. Determine the empirical formula of the compound.
7) When 3.269 g of zinc is heated in pure oxygen, the sample gains 0.800g of oxygen in forming
zinc oxide. Calculate the empirical formula of the compound.
8) If cobalt metal is mixed with sulfur and heated strongly, cobalt sulfide is produced that contains
55.06% cobalt by mass. Calculate the empirical formula of the sulfide. (Looking for the empirical
formula for cobalt sulfide)
9) A compound that contains only carbon, hydrogen and oxygen is 48.64% carbon and 8.16%
hydrogen by mass. What is the empirical formula for the compound?
10) When a 0.3546 g sample of vanadium metal is heated in air, it reacts with oxygen to achieve a
final mass of 0.6330 g. Calculate the empirical formula of this vanadium oxide.