The Mole Concept

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

Back

0.05 moles

Front

How many molecules are in 1 mole of any substance?

Back

There are 6.02 x 10^23 molecules in 1 mole of any substance.

Front

What is the number of moles in 222.0 g of Ca(OH)2?

Back

3 moles

Front

How many molecules are in 2.00 moles of H2O?

Back

1.20 x 10^24 molecules of H2O

Front

What is the formula to convert grams to moles?

Back

Moles = Mass (g) / Molar Mass (g/mol)

Front

What is the molar mass of water (H2O)?

Back

The molar mass of water is approximately 18.02 g/mol.

Front

If you have 1 mole of NaCl, how many grams do you have?

Back

You have approximately 58.44 grams of NaCl.

Front

What is the relationship between moles and molecules?

Back

1 mole of a substance contains Avogadro's number (6.02 x 10^23) of molecules.

Front

How do you calculate the number of moles from a given mass?

Back

Divide the mass of the substance by its molar mass.