Mole Conversions (PreAP)

Front

What is a mole in chemistry?

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A mole is a unit of measurement used to express the amount of a 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

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). It is calculated by summing the atomic masses of all atoms in a molecule.

Front

What is the volume of one mole of gas at standard temperature and pressure (STP)?

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At STP, one mole of an ideal gas occupies 22.4 liters.

Front

How do you convert liters of gas to moles?

Back

To convert liters of gas to moles at STP, use the formula: Moles = Volume (L) / 22.4 L/mol.

Front

What is Avogadro's number?

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Avogadro's number is 6.022 x 10^23, which is the number of atoms, molecules, or particles in one mole of a substance.

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How do you calculate the number of molecules in a given mass of a substance?

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To calculate the number of molecules, first convert the mass to moles using the molar mass, then multiply the number of moles by Avogadro's number.

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What is the relationship between moles and mass?

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

Front

How do you find the molar mass of a compound?

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To find the molar mass, add the atomic masses of all the atoms in the compound's formula.

Front

What is the significance of STP in gas calculations?

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STP (Standard Temperature and Pressure) provides a reference point for gas calculations, allowing for consistent measurements of gas volume.

Front

How do you convert grams to moles?

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