Empirical Formulas
Chapter 3
University of Arkansas - Little Rock
Dr. Robert Belford




Question 1
What is the empirical formula of a sample which is 12.6% H & 87.4 % N?
(A)  NH
(B)  NH2
(C)  NH3
(D)  NH4
 
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Question 2
What is the empirical formula of a sample which is 17.7% H & 82.3 % N?
(A)  NH
(B)  NH2
(C)  NH3
(D)  NH4
 
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Question 3
What is the empirical formula of a sample which is 22.2% H & 77.8 % N?
(A)  NH
(B)  NH2
(C)  NH3
(D)  NH4
 
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Question 4
A sample is composed of the elements potassium, nitrogen and oxygen. What is its empirical formula if it is 38.7% potassium & 13.9% nitrogen?
(A)  K2N2O3
(B)  KNO2
(C)  KNO3
(D)  KN2O3
 
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Question 5
What is the empirical formula of a compound that is 36.8% Nitrogen and 63.2% Oxygen?
(A)  N2O5
(B)  N2O3
(C)  NO2
(D)  NO3
 
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Question 6
What is the empirical formula of a compound that is 48.2% C, 8.2% H & 43.2% O?
(A)  C6H5O3
(B)  CH3O
(C)  C3H6O2
(D)  C3H6O
 
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Question 7
What is the empirical formula of a compound that contains 8.46 g Na, 11.81 g S and 8.87 g O?
(A)  Na2SO3
(B)  Na2S4
(C)  Na2S2O3
(D)  NaSO3
 
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Question 8
A material is deemed to be composed of the elements carbon, hydrogen and chlorine. Determine the empirical formula if a 9.66 g sample contains 4.74 g carbon and .264 g hydrogen.
(A)  CHCl3
(B)  CH3Cl
(C)  CH2Cl2
(D)  C3H2Cl
 
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