U03 Mole Conversions

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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 convert grams to moles?

Back

To convert grams to moles, use the formula: Moles = Mass (g) / Molar Mass (g/mol).

Front

What is the molar mass of water (H2O)?

Back

The molar mass of water is approximately 18.0 g/mol.

Front

How many molecules are in one mole of a substance?

Back

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

Front

Convert 500 grams of water to moles.

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500 g H2O x (1 mol H2O / 18.0 g H2O) = 27.78 mol H2O.

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What is scientific notation?

Back

Scientific notation is a way of expressing numbers that are too large or too small to be conveniently written in decimal form. It is written as a product of a number between 1 and 10 and a power of 10.

Front

Convert 0.00045 to scientific notation.

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0.00045 = 4.5 x 10^-4.

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How do you convert millimeters to centimeters?

Back

To convert millimeters to centimeters, divide the number of millimeters by 10.

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Convert 150 mm to cm.

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150 mm = 15 cm.

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How do you find the total number of atoms in a compound?

Back

To find the total number of atoms in a compound, multiply the number of molecules by the number of atoms in one molecule.