3-5: Empirical Formula
Chapter 3

Dr. Robert Belford & Rebekah Reinhart




Question 1
What is the empirical formula for a compound that is 29% Na, 40.5% S and 30.5% O by mass?
(A)  Na4S4O6
(B)  Na2S2O3
(C)  NaSO4
(D)  None of the above
 
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Question 2
What is the empirical formula for a compound containing 70% Fe and 30% O by mass?
(A)  Fe2O3
(B)  FeO3
(C)  Fe4O3
(D)  None of the above
 
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Question 3
What is the empirical formula of a compound that contains only 43.7 grams N and only 6.3 grams H?
(A)  NH4
(B)  NH3
(C)  NH2
(D)  None of the above
 
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Question 4
What is the empirical formula that is 43.3% sodium, 11.3% carbon, and 45.4% oxygen by mass?
(A)  Na2CO2
(B)  Na2CO3
(C)  NaC2O3
(D)  None of the above
 
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Question 5
What is the empirical formula for a compound that contains only 13.0 grams lead, and only 2.0 grams oxygen?

(A)  PbO2
(B)  Pb3O2
(C)  Pb2O3
(D)  None of the above
 
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