The Mole Concept - a Review

Front

What is the mole concept?

Back

The mole concept is a method used in chemistry to quantify the amount of substance. One mole is defined as 6.02 x 10^23 particles (atoms, molecules, ions, etc.) of that substance.

Front

What is molar mass?

Back

Molar mass is the mass of one mole of a substance, typically expressed in grams per mole (g/mole). It is calculated by adding the atomic masses of all the atoms in a molecule.

Tags

NGSS.HS-PS1-7

Front

How many atoms are in one mole of any element?

Back

One mole of any element contains 6.02 x 10^23 atoms of that element.

Front

What is the molar mass of water (H2O)?

Back

The molar mass of water (H2O) is approximately 18 g/mole (2 g/mole for H and 16 g/mole for O).

Front

Fill in the blank: 1 mole of sodium (Na) is equal to _____ g Na.

Back

23 g Na.

Front

What is the molar mass of sodium chloride (NaCl)?

Back

The molar mass of sodium chloride (NaCl) is approximately 58 g/mole (23 g/mole for Na and 35.5 g/mole for Cl).

Front

True or False? Molar mass is the same as molecular weight.

Back

True. Molar mass and molecular weight are often used interchangeably in chemistry.

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What is the relationship between moles, mass, and molar mass?

Back

The relationship is given by the formula: Moles = Mass (g) / Molar Mass (g/mole).

Front

How do you convert grams to moles?

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To convert grams to moles, divide the mass of the substance (in grams) by its molar mass (in g/mole).

Front

What is the molar mass of carbon dioxide (CO2)?

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The molar mass of carbon dioxide (CO2) is approximately 44 g/mole (12 g/mole for C and 32 g/mole for O2).