Empirical and 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

Which of the following is a molecular formula only? C3H9, NaCl, Mg(OH)2, H2O

Back

C3H9 is a molecular formula only.

Front

Which pair has the same empirical formula? NaCrO4 and Na2Cr2O7, C2H4O2 and C6H12O6, C3H6O3 and C2H6O2, CH4 and C2H6

Back

C2H4O2 and C6H12O6 have the same empirical formula.

Front

What is the empirical formula of C6H12?

Back

The empirical formula is C3H6.

Front

If the empirical formula is CF2 and the molecular formula mass is 192 g/mol, what is the molecular formula?

Back

The molecular formula is C4F8.

Front

What is the difference between empirical and molecular formulas?

Back

Empirical formulas show the simplest ratio of elements, while molecular formulas show the actual number of atoms in a molecule.

Front

Which of the following is not an empirical formula? H2O, N2O5, C10H23, P4H10

Back

P4H10 is not an empirical formula.

Front

Which of the following formulas is not a molecular formula? C12H24O12, H2O2, N2O2, C12H24OH

Back

C12H24OH is not a molecular formula.