Multiple Choice
Which of the following is the correct molecular formula for glucose?
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3. Chemical Reactions
Molecular Formula
Multiple Choice
To determine the molecular formula of a compound, which information is required in addition to its empirical formula?
A
The compound’s density at STP
B
The number of neutrons in each atom
C
The compound’s melting point
D
The compound’s molar mass
Verified step by step guidance1
Understand that the empirical formula gives the simplest whole-number ratio of atoms in a compound but does not provide the actual number of atoms in a molecule.
Recognize that to find the molecular formula, you need to know how many times the empirical formula unit repeats in the actual molecule.
Identify that the molar mass (molecular weight) of the compound is essential because it allows you to compare the empirical formula mass to the actual molecular mass.
Calculate the empirical formula mass by summing the atomic masses of all atoms in the empirical formula using the periodic table.
Divide the compound's molar mass by the empirical formula mass to find a whole number multiplier, which you then multiply by the empirical formula to get the molecular formula.
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