Mole, Molar Mass, Ionic Compounds

Front

What is the definition of a mole in chemistry?

Back

A mole is a unit of measurement in chemistry that represents 6.02 x 10^23 particles, atoms, or molecules.

Front

How do you calculate the molar mass of a compound?

Back

To calculate the molar mass of a compound, sum the atomic masses of all the atoms in the molecular formula.

Front

What is the molar mass of water (H2O)?

Back

The molar mass of water (H2O) is approximately 18 grams/mole.

Front

If you have 2 moles of a substance, how many particles do you have?

Back

You have 2 x 6.02 x 10^23 particles, which equals approximately 1.204 x 10^24 particles.

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 (mass = moles x molar mass).

Front

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

Back

The molar mass of sodium chloride (NaCl) is approximately 58.5 grams/mole.

Front

How many moles are in 150 grams of Na2O?

Back

To find the number of moles, divide the mass by the molar mass of Na2O (62 grams/mole). 150 grams / 62 grams/mole = approximately 2.42 moles.

Front

What is the significance of Avogadro's number?

Back

Avogadro's number (6.02 x 10^23) is significant because it defines the number of particles in one mole of a substance.

Front

How do you determine which sample contains the most atoms?

Back

To determine which sample contains the most atoms, compare the number of moles and the type of atoms in each sample.

Front

What is the molar mass of aluminum oxide (Al2O3)?

Back

The molar mass of aluminum oxide (Al2O3) is approximately 102 grams/mole.