Chapter 10 Test (The Mole)

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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

How many atoms are in 1 mole of a substance?

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1 mole of any substance contains approximately 6.022 x 10^23 entities, known as Avogadro's number.

Front

What is the relationship between moles and mass?

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The mass of a substance in grams is equal to the number of moles multiplied by the molar mass of the substance (Mass = Moles x Molar Mass).

Front

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

Back

To find the number of molecules, multiply the number of moles by Avogadro's number (Number of molecules = Moles x 6.022 x 10^23).

Front

What is molar mass?

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Molar mass is the mass of one mole of a substance, typically expressed in grams per mole (g/mol).

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How do you convert grams to moles?

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To convert grams to moles, divide the mass of the substance by its molar mass (Moles = Mass / Molar Mass).

Front

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

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The molar mass of sodium chloride (NaCl) is 58.443 g/mol.

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How many moles are in 3.01 x 10^22 atoms of magnesium?

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There are 0.050 moles of magnesium in 3.01 x 10^22 atoms.

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How many molecules are in 2.5 moles of NaCl?

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There are approximately 1.51 x 10^24 molecules in 2.5 moles of NaCl.

Front

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

Back

Number of atoms = Moles x Avogadro's number (6.022 x 10^23).