3-6: Molecular Formula
Chapter 3

Dr. Robert Belford & Rebekah Reinhart



Question 1
Determine the molecular formula of CH2O. The molecular mass of the compound is 180.1g/mol.
(A)  C4H6O4
(B)  C6H12O6
(C)  C12H6O12
(D)  None of the above
 
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Question 2
An organic compound is found to contain 42.9% carbon, 6.4% hydrogen by mass and the remainder of the compound is oxygen. Determine the molecular formula. The molecular mass of the compound is 504.4g/mol.
(A)  C18H32O16
(B)  C9H16O8
(C)  C7H9O5
(D)  None of the above
 
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Question 3
A compound containing only carbon, hydrogen, and oxygen is found to contain 40.9% carbon and 54.5% oxygen by mass. The molecular mass of the compound is 176.13g/mol. Determine the molecular formula
(A)  C12H16O12
(B)  C6H8O6
(C)  C3H4O3
(D)  None of the above
 
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Question 4
Determine the molecular formula of CH3O. The molecular mass of the compound is 62.07g/mol.
(A)  CH3O
(B)  C4H12O4
(C)  C2H6O2
(D)  None of the above
 
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Question 5
A compound contains only carbon and hydrogen. It is 93.75% carbon by mass. Determine the molecular formula. The molecular mass of the compound is 128.2g/mol.
(A)  C5H4
(B)  C10H8
(C)  C6H2
(D)  None of the above
 
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