Moles/Molar Mass

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 do you calculate the number of moles from grams?

Back

Number of moles = mass (grams) / molar mass (g/mol).

Front

What is molar mass?

Back

Molar mass is the mass of one mole of a substance, typically expressed in grams per mole (g/mol). It is calculated by summing the atomic masses of all atoms in a molecule.

Front

What is the molar mass of potassium sulfide (K2S)?

Back

The molar mass of K2S is approximately 110.26 g/mol.

Front

How many atoms are in one mole of a substance?

Back

One mole of a substance contains approximately 6.022 x 10^23 entities, known as Avogadro's number.

Front

What is the molar mass of sodium hydroxide (NaOH)?

Back

The molar mass of NaOH is 40 g/mol.

Front

How do you convert atoms to moles?

Back

To convert atoms to moles, divide the number of atoms by Avogadro's number (6.022 x 10^23).

Front

What is the molar mass of sodium (Na)?

Back

The molar mass of sodium is approximately 23.0 g/mol.

Front

What is the relationship between atomic mass and molar mass?

Back

The molar mass of an element is numerically equal to its atomic mass, but expressed in grams per mole.

Front

How many moles are in 3.01 x 10^22 atoms of magnesium?

Back

There are 0.05 moles of magnesium in 3.01 x 10^22 atoms.