Empirical & Molecular Formulas

Front

What is the definition of a coefficient in a chemical equation?

Back

The big number that tells you the number of molecules.

Front

What is the empirical formula for Si2F6?

Back

SiF3

Front

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

Back

C2H4O2 and C6H12O6

Front

What is the molecular formula for glycerol with a molar mass of 92.09g/mol and percent composition of 39.12% C, 8.75% H, and 51.12% O?

Back

C3H8O3

Front

What is the molecular formula for a compound with the empirical formula K2SO4 and a molecular mass of 696g?

Back

K8S4O16

Front

Define empirical formula.

Back

The simplest whole-number ratio of atoms of each element in a compound.

Front

What is a molecular formula?

Back

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

Front

How do you calculate the percent composition of an element in a compound?

Back

(mass of element in 1 mole of compound / molar mass of compound) x 100%.

Front

What is the relationship between empirical and molecular formulas?

Back

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

Front

What is the empirical formula for C6H12O6?

Back

CH2O