Mole Concept

Front

What is Avogadro's Number?

Back

Avogadro's Number is 6.02 x 10^23, which represents the number of particles (atoms, molecules, etc.) in one mole of a substance.

Front

How do you calculate the mass of a substance from moles?

Back

To calculate the mass of a substance from moles, use the formula: Mass (g) = Moles x Molar Mass (g/mol).

Front

What is the molar mass of sodium chloride (NaCl)?

Back

The molar mass of sodium chloride (NaCl) is approximately 58.44 g/mol.

Front

If I have 20.4 moles of sodium chloride, how much does it weigh?

Back

To find the weight, multiply the moles by the molar mass: 20.4 moles x 58.44 g/mol = 1192 g.

Front

What is the molar mass of magnesium (Mg)?

Back

The molar mass of magnesium (Mg) is approximately 24.31 g/mol.

Front

How do you find the mass of a substance given the number of moles?

Back

Multiply the number of moles by the molar mass of the substance.

Front

What is the mass of 0.75 moles of magnesium (Mg)?

Back

0.75 moles x 24.31 g/mol = 18 grams.

Front

What is the molar mass of water (H2O)?

Back

The molar mass of water (H2O) is approximately 18.02 g/mol.

Front

What is the mass of 1.5 moles of water (H2O)?

Back

1.5 moles x 18.02 g/mol = 27 grams.

Front

How do you calculate the molar mass of a compound?

Back

Add the atomic masses of all the atoms in the compound's formula.