The Mole

Front

What is a mole in chemistry?

Back

A mole is a unit of measurement used to express the amount of a substance. It is defined as the amount of substance that contains as many entities (atoms, molecules, etc.) as there are in 12 grams of carbon-12.

Front

How is the atomic mass of an element defined?

Back

The atomic mass of an element is the weighted average mass of the atoms in a naturally occurring sample of the element, measured in atomic mass units (amu).

Front

What is Avogadro's Number?

Back

Avogadro's Number is 6.02 x 10^23, which is the number of atoms, molecules, or particles in one mole of a substance.

Front

How do you convert atoms to moles?

Back

To convert atoms to moles, divide the number of atoms by Avogadro's Number (6.02 x 10^23).

Front

What is the molar mass of a substance?

Back

The molar mass is the mass of one mole of a substance, typically expressed in grams per mole (g/mol).

Front

How do you calculate the molar mass of a compound?

Back

To calculate the molar mass of a compound, sum the molar masses of all the elements in the compound, multiplied by the number of times each element appears in the formula.

Front

What is the relationship between moles and mass?

Back

The relationship is given by the formula: Mass (g) = Moles x Molar Mass (g/mol).

Front

How many molecules are in one mole of a substance?

Back

There are 6.02 x 10^23 molecules in one mole of any substance.

Front

What is the molar mass of sodium chloride (NaCl)?

Back

The molar mass of sodium chloride (NaCl) is 58.443 g/mol.

Front

How do you find the number of moles from mass?

Back

To find the number of moles from mass, use the formula: Moles = Mass (g) / Molar Mass (g/mol).