Mole Conversions

Front

What is the molar mass of a compound?

Back

The molar mass is the mass of one mole of a substance, typically expressed in grams per mole (g/mol). It is calculated by summing the atomic masses of all atoms in the molecular formula.

Front

How do you calculate the molar mass of a compound like PbSO4?

Back

To calculate the molar mass of PbSO4, add the atomic masses of lead (Pb), sulfur (S), and four oxygen (O) atoms: Pb (207.2 g/mol) + S (32.07 g/mol) + 4*O (16.00 g/mol) = 303.27 g/mol.

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 grams are in 1 mole of neon (Ne)?

Back

1 mole of neon (Ne) weighs 20.18 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 (grams/mole).

Front

What is the mass of 4.20 moles of C6H12?

Back

To find the mass, calculate the molar mass of C6H12 (C: 12.01 g/mol, H: 1.008 g/mol) = 6*12.01 + 12*1.008 = 84.16 g/mol. Then, multiply by 4.20 moles: 4.20 moles * 84.16 g/mol = 353 g.

Front

How do you calculate the molar mass of CO2?

Back

To calculate the molar mass of CO2, add the atomic mass of carbon (C: 12.01 g/mol) and two oxygen atoms (O: 16.00 g/mol): 12.01 + 2*16.00 = 44.01 g/mol.

Front

What is the relationship between moles and atoms?

Back

One mole of any substance contains Avogadro's number (6.02 x 10^23) of atoms or molecules.

Front

If you have 2 moles of sulfur (S), how many atoms do you have?

Back

2 moles of sulfur contain 2 * 6.02 x 10^23 = 1.204 x 10^24 atoms.

Front

What is the significance of molar mass in chemical reactions?

Back

Molar mass is crucial for stoichiometry, allowing chemists to convert between grams and moles to predict the amounts of reactants and products in a chemical reaction.