Front

What is a mole in chemistry?

Back

A mole is a unit of measurement used to express amounts of a chemical substance. It is defined as the amount of substance that contains as many entities (atoms, molecules, etc.) as there are in 12 grams of carbon-12.

Front

How many atoms are in one mole of a substance?

Back

One mole of any substance contains approximately 6.022 x 10^23 entities, known as Avogadro's number.

Front

What is the molar mass of an element?

Back

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

Front

How do you convert grams to moles?

Back

To convert grams to moles, divide the mass of the substance (in grams) by its molar mass (in g/mol). Formula: Moles = Mass (g) / Molar Mass (g/mol).

Front

What is the molar mass of AlCl3?

Back

The molar mass of AlCl3 (Aluminum Chloride) is approximately 133.33 g/mol.

Front

How do you calculate the mass of a sample from the number of moles?

Back

To calculate the mass of a sample from the number of moles, multiply the number of moles by the molar mass of the substance. Formula: Mass (g) = Moles x Molar Mass (g/mol).

Front

What is the mass of one mole of silver (Ag)?

Back

The mass of one mole of silver is 107.87 g.

Front

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

Back

To find the number of atoms in a given mass, first convert the mass to moles, then multiply by Avogadro's number. Formula: Number of Atoms = (Mass (g) / Molar Mass (g/mol)) x Avogadro's Number.

Front

What is the molar mass of CO2?

Back

The molar mass of carbon dioxide (CO2) is approximately 44.01 g/mol.

Front

How many moles are in 48.86 g of cobalt (Co)?

Back

To find the number of moles in 48.86 g of cobalt, divide by its molar mass (58.93 g/mol): Moles = 48.86 g / 58.93 g/mol = 0.8291 moles.