Unit 5 Moles and Molar Mass

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 do you calculate the number of moles from grams?

Back

Number of moles = mass (g) / molar mass (g/mol).

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 many moles are in 98.3 grams of aluminum hydroxide, Al(OH)3?

Back

1.26 moles.

Front

How do you convert atoms to moles?

Back

To convert atoms to moles, use the formula: Number of moles = number of atoms / Avogadro's number (6.022 x 10^23).

Front

How many moles are in 5.11 x 10^23 atoms of lithium (Li)?

Back

0.849 moles.

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What is the formula to calculate mass from moles?

Back

Mass (g) = number of moles x molar mass (g/mol).

Front

If Shivani measures out 6.0 moles of epsom salt (MgSO4), how many grams does she have?

Back

720 g.

Front

How many moles are in 32.3 grams of carbon dioxide (CO2)?

Back

0.73 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.