Molar mass and Mole Conversions Flashcard-30 min

Front

What is Avogadro's number?

Back

Avogadro's number is 6.022 x 10^23, which represents the number of representative particles (atoms, molecules, etc.) in one mole of a substance.

Front

What is the definition of a mole?

Back

A mole is a unit of measurement in chemistry that represents 6.022 x 10^23 representative particles of a substance.

Front

How do you calculate the number of moles from volume at STP?

Back

To calculate the number of moles from volume at STP, use the formula: Moles = Volume (L) / 22.4 L/mol.

Front

What is the molar mass of a substance?

Back

The molar mass is the mass of one mole of a substance, typically expressed in grams per mole (g/mol).

Front

How do you find the molar mass of a compound?

Back

To find the molar mass of a compound, sum the molar masses of all the atoms in its chemical formula.

Front

What is the molar mass of Nitrogen gas (N2)?

Back

The molar mass of Nitrogen gas (N2) is 28.02 g/mol.

Front

How many grams are in 3.33 moles of Potassium Sulfide (K2S)?

Back

To find the grams, multiply the number of moles by the molar mass of K2S (110.26 g/mol): 3.33 mol x 110.26 g/mol = 367 g.

Front

What is the formula to convert grams to moles?

Back

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

Front

How do you calculate the number of particles in a sample?

Back

To calculate the number of particles, use the formula: Number of particles = Moles x Avogadro's number.

Front

How many particles are in 13.5 grams of Beryllium (Be)?

Back

First, find moles: Moles = 13.5 g / 9.0122 g/mol = 1.5 mol. Then, Number of particles = 1.5 mol x 6.022 x 10^23 = 9 x 10^23 particles.