Front

What is a mole in chemistry?

Back

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 Avogadro's number?

Back

Avogadro's number is 6.02 x 10^23, which is the number of particles (atoms, molecules, etc.) in one mole of a substance.

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How do you calculate the number of grams from moles?

Back

To calculate the number of grams from moles, use the formula: grams = moles x molar mass.

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

How many grams are in 1 mole of water (H2O)?

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1 mole of water (H2O) has a molar mass of approximately 18.02 g.

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What is the relationship between moles and particles?

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The relationship is defined by Avogadro's number: 1 mole of any substance contains 6.02 x 10^23 particles.

Front

How do you convert grams to moles?

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To convert grams to moles, use the formula: moles = grams / molar mass.

Front

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

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

Front

How many moles are in 100 grams of sodium chloride (NaCl)?

Back

To find the number of moles in 100 grams of NaCl, divide 100 g by the molar mass of NaCl (approximately 58.44 g/mol), which equals about 1.71 moles.

Front

What is the formula to find the number of moles from the number of atoms?

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The formula is: moles = number of atoms / Avogadro's number.