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)
NH
2
(C)
NH
3
(D)
NH
4
Hint
Your response
Not answered yet
Question 2
What is the empirical formula of a sample which is 17.7% H & 82.3 % N?
(A)
NH
(B)
NH
2
(C)
NH
3
(D)
NH
4
Hint
Your response
Not answered yet
Question 3
What is the empirical formula of a sample which is 22.2% H & 77.8 % N?
(A)
NH
(B)
NH
2
(C)
NH
3
(D)
NH
4
Hint
Your response
Not answered yet
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)
K
2
N
2
O
3
(B)
KNO
2
(C)
KNO
3
(D)
KN
2
O
3
Hint
Your response
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Question 5
What is the empirical formula of a compound that is 36.8% Nitrogen and 63.2% Oxygen?
(A)
N
2
O
5
(B)
N
2
O
3
(C)
NO
2
(D)
NO
3
Hint
Your response
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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)
C
6
H
5
O
3
(B)
CH
3
O
(C)
C
3
H
6
O
2
(D)
C
3
H
6
O
Hint
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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)
Na
2
SO
3
(B)
Na
2
S
4
(C)
Na
2
S
2
O
3
(D)
NaSO
3
Hint
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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)
CHCl
3
(B)
CH
3
Cl
(C)
CH
2
Cl
2
(D)
C
3
H
2
Cl
Hint
Your response
Not answered yet