The Mole Review

Front

What is the definition of a mole in chemistry?

Back

A mole is the SI unit for the amount of a substance, defined as containing exactly 6.022 x 10^23 particles (atoms, molecules, ions, etc.).

Front

How do you convert moles of a substance to grams?

Back

To convert moles to grams, multiply the number of moles by the substance's molar mass (in grams per mole).

Front

What is the molar mass of sodium (Na)?

Back

The molar mass of sodium (Na) is approximately 22.99 g/mol.

Front

What is the molar mass of aluminum (Al)?

Back

The molar mass of aluminum (Al) is approximately 26.98 g/mol.

Front

What is the relationship between moles and mass?

Back

The mass of a substance in grams is equal to the number of moles multiplied by its molar mass.

Front

What are the units for molar mass?

Back

The units for molar mass are grams per mole (g/mol).

Front

How many grams are in 2.50 moles of sodium?

Back

To find the mass, multiply 2.50 moles by the molar mass of sodium (22.99 g/mol), which equals approximately 57.48 grams.

Front

What is dimensional analysis in chemistry?

Back

Dimensional analysis is a mathematical technique used to convert between units by multiplying by conversion factors.

Front

What is the significance of Avogadro's number?

Back

Avogadro's number (6.022 x 10^23) is significant because it defines the number of particles in one mole of a substance.

Front

How do you find the molar mass of a compound?

Back

To find the molar mass of a compound, sum the molar masses of all the elements in the compound, multiplied by their respective quantities.