Multiple Choice
Determine the molecular formula for the compound with a molar mass of 46.08 g/mol and the following percent composition: C: 26.06%, H: 13.13%, N: 60.81%.
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3. Chemical Reactions
Molecular Formula
Multiple Choice
The molar mass of a compound is 52.07 g/mol. Its empirical formula is CH. Determine the molecular formula of the compound.
A
C6H6
B
C4H4
C
CH
D
C2H2
Verified step by step guidance1
First, determine the molar mass of the empirical formula CH. Carbon (C) has a molar mass of approximately 12.01 g/mol, and hydrogen (H) has a molar mass of approximately 1.01 g/mol. Therefore, the molar mass of CH is calculated as: g/mol.
Calculate the molar mass of the empirical formula CH: g/mol.
Next, determine how many times the empirical formula mass fits into the given molar mass of the compound, which is 52.07 g/mol. Divide the molar mass of the compound by the molar mass of the empirical formula: .
The result from the division will give you the number of empirical units in the molecular formula. This number should be a whole number, indicating how many times the empirical formula is repeated in the molecular formula.
Multiply the subscripts in the empirical formula CH by the whole number obtained from the division to find the molecular formula. If the division yields 4, for example, the molecular formula would be C2H2.
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