Chapter 3: Mathematics of Formulas and Equations Chem. Regents

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

Which of the following is an empirical formula: H2O2, C2H6O12, CaCl2, N2O8?

Back

CaCl2 is an empirical formula.

Front

What is the molar mass of dinitrogen tetroxide (N2O4)?

Back

The molar mass of dinitrogen tetroxide is 92 g/mol.

Front

How do you calculate the molar mass of a compound?

Back

To calculate the molar mass, sum the atomic masses of all atoms in the formula.

Front

What is the empirical formula for a substance with a molecular formula of C4F8?

Back

The empirical formula is CF2.

Front

What is the mass of one mole of aluminum (Al)?

Back

The mass of one mole of aluminum is 27 g.

Front

What is the molar mass of table salt (NaCl)?

Back

The molar mass of table salt is 58 g/mol.

Front

Define 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 molecular formula of a compound with an empirical formula of CF2 and a molecular formula mass of 200 g/mol?

Back

The molecular formula is C4F8.

Front

What is the significance of the empirical formula in chemistry?

Back

The empirical formula provides the simplest ratio of elements in a compound, which is useful for understanding its composition.