Do Now - AP - Molar Mass

Front

What is molar mass?

Back

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 a molecule.

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 molar mass of water (H2O)?

Back

The molar mass of water is 18.016 g/mol.

Front

How many moles are in 1.0 g of Aluminum (Al)?

Back

Number of moles = 1.0 g / 26.98 g/mol = 0.037 moles.

Front

What is Avogadro's number?

Back

Avogadro's number is 6.022 x 10^23, which is the number of atoms, molecules, or particles in one mole of a substance.

Front

How many oxygen atoms are in one mole of CO3?

Back

There are 3 oxygen atoms in one mole of CO3.

Front

If you have 1.0 g of CO3, how many moles do you have?

Back

Number of moles = 1.0 g / 60.01 g/mol (molar mass of CO3) = 0.0167 moles.

Front

What is the relationship between grams and moles?

Back

Grams can be converted to moles using the formula: moles = grams / molar mass.

Front

How do you find the number of atoms in a given mass of an element?

Back

Number of atoms = (mass in grams / molar mass) x Avogadro's number.

Front

What is the molar mass of a compound XY if it is given as 140.1 g/mol?

Back

The molar mass of compound XY is 140.1 g/mol.