Moles

Front

What is a mole?

Back

A mole is a unit of measurement in chemistry that represents 6.022 x 10²³ particles (atoms, molecules, ions, etc.).

Front

How do you calculate the number of molecules in a given mass of a substance?

Back

To calculate the number of molecules, use the formula: Number of molecules = (mass in grams / molar mass) x Avogadro's number (6.022 x 10²³).

Front

What is Avogadro's number?

Back

Avogadro's number is 6.022 x 10²³, which is the number of particles in one mole of a substance.

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).

Front

How do you find the molar mass of a compound?

Back

To find the molar mass, sum the atomic masses of all the atoms in the compound's formula.

Front

What is the relationship between moles and molecules?

Back

1 mole of any substance contains 6.022 x 10²³ molecules.

Front

How many molecules are in 1 mole of water (H₂O)?

Back

1 mole of water contains 6.022 x 10²³ molecules.

Front

If you have 2 moles of NaCl, how many formula units do you have?

Back

You have 2 x 6.022 x 10²³ = 1.2044 x 10²⁴ formula units of NaCl.

Front

What is the mass of 1 mole of carbon (C)?

Back

The mass of 1 mole of carbon is 12 grams.

Front

How do you convert moles to grams?

Back

To convert moles to grams, multiply the number of moles by the molar mass of the substance.