Empirical vs Molecular Formulas

Front

What is an empirical formula?

Back

An empirical formula represents the simplest whole-number ratio of atoms of each element in a compound.

Front

What is a molecular formula?

Back

A molecular formula shows the actual number of atoms of each element in a molecule of a compound.

Front

How do you determine the empirical formula from a molecular formula?

Back

To find the empirical formula, divide the subscripts in the molecular formula by their greatest common divisor.

Front

What is the empirical formula of glucose, C6H12O6?

Back

CH2O

Front

If the empirical formula of a compound is CH2O and its molar mass is 180 g/mol, what is its molecular formula?

Back

C6H12O6

Front

What is the relationship between empirical and molecular formulas?

Back

The molecular formula is a multiple of the empirical formula.

Front

How do you calculate the molar mass of a compound?

Back

Add the atomic masses of all the atoms in the molecular formula.

Front

What is the molar mass of CH2O?

Back

The molar mass of CH2O is approximately 30.03 g/mol.

Front

If a compound has a molar mass of 216.018 g/mol and an empirical formula of N2O5, what is its molecular formula?

Back

N4O10

Front

What is the empirical formula of a compound with the molecular formula C4H8?

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CH2