empirical and molecular formulas

Front

What is an empirical formula?

Back

An empirical formula represents the simplest whole-number ratio of elements 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 molecular formula from the empirical formula?

Back

To find the molecular formula, divide the molar mass of the compound by the molar mass of the empirical formula, then multiply the subscripts in the empirical formula by this ratio.

Front

What is the empirical formula of C8H10N4O2?

Back

C4H5N2O.

Front

Which of the following is NOT an empirical formula: C3H8, Na2SO4, N2O4, Al3(SO4)2?

Back

N2O4.

Front

What is the empirical formula for a compound with 87.1% Ag and 12.9% S?

Back

Ag2S.

Front

What is the molar mass of CH2O?

Back

The molar mass of CH2O is approximately 30 g/mol.

Front

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

Back

C6H12O6.

Front

Define the term 'molar mass'.

Back

Molar mass is the mass of one mole of a substance, typically expressed in grams per mole (g/mol).

Front

What is the significance of empirical formulas in chemistry?

Back

Empirical formulas provide a quick way to understand the composition of a compound without detailing the structure.