Moles

Front

What is a mole in chemistry?

Back

A mole is a unit of measurement used to express amounts of a chemical substance, defined as exactly 6.022 x 10^23 particles (atoms, molecules, ions, etc.).

Front

How many atoms are in one mole of any substance?

Back

6.022 x 10^23 atoms.

Front

What is the molar mass of an element?

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 number of moles from mass?

Back

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

Front

What is the relationship between moles and molecules?

Back

1 mole of a substance contains 6.022 x 10^23 molecules of that substance.

Front

How do you convert grams to moles?

Back

To convert grams to moles, divide the mass of the substance by its molar mass.

Front

What is the formula to find the mass of a substance from moles?

Back

Mass (g) = Number of moles x Molar mass (g/mol).

Front

How many moles are in 12 grams of carbon (C)?

Back

1 mole (since the molar mass of carbon is 12 g/mol).

Front

What is Avogadro's number?

Back

Avogadro's number is 6.022 x 10^23, which is the number of particles in one mole of a substance.

Front

How many molecules are in 2 moles of water (H2O)?

Back

2 moles of water contain 2 x 6.022 x 10^23 = 1.2044 x 10^24 molecules.