Chemistry - Moles

Front

What is a mole in chemistry?

Back

A mole is a large number used to count particles, specifically 6.022 x 10^23 particles.

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 atoms are in 12 grams of carbon-12?

Back

There are 6.022 x 10^23 atoms in 12 grams of carbon-12.

Front

What is the number of particles in 22g of carbon dioxide?

Back

3.01 x 10^23 particles.

Front

Which has more molecules: 1 mole H2O, 1 mole Al(OH)3, or 1 mole NaCl?

Back

They all have the same number of molecules.

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 the molar mass of the substance.

Front

What is molar mass?

Back

Molar mass is the mass of one mole of a substance, usually 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 formula to find the number of particles from moles?

Back

Number of particles = moles x Avogadro's number (6.022 x 10^23).

Front

What is the significance of Avogadro's number in chemistry?

Back

It allows chemists to count particles by weighing them.