% Comp/Empirical/Molecular Formulas

Front

What is the empirical formula?

Back

The empirical formula is the simplest whole-number ratio of moles of elements in a compound.

Front

What is the molecular formula?

Back

The molecular formula shows the actual number and kinds of atoms present in one molecule of a compound.

Front

How do you determine the empirical formula from percentage composition?

Back

Convert the percentages to grams, then to moles, and find the simplest whole-number ratio.

Front

Given 40.05% S and 59.95% O, what is the empirical formula?

Back

SO3

Front

What is the relationship between empirical and molecular formulas?

Back

The molecular formula is a whole-number multiple of the empirical formula.

Front

If the empirical formula is CH2O and the molar mass is 180.18 g/mol, what is the molecular formula?

Back

C6H12O6

Front

What is the significance of the empirical formula in chemistry?

Back

It provides the simplest ratio of elements in a compound, useful for understanding composition.

Front

Which pair has the same empirical formula: NaCrO4 and Na2Cr2O7 or C2H4O2 and C6H12O6?

Back

C2H4O2 and C6H12O6.

Front

What is the formula for calculating moles from grams?

Back

Moles = mass (g) / molar mass (g/mol).

Front

What does a molecular formula indicate about a compound?

Back

It indicates the actual number of each type of atom in a molecule.