The Mole Concept-Topic Flashcard

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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.

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

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To calculate the number of molecules, multiply the number of moles by Avogadro's number (6.02 x 10^23). For example, 5.2 moles of water contains 5.2 x 6.02 x 10^23 = 3.1 x 10^24 molecules.

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What is molar mass?

Back

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.

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How do you find the molar mass of HCl?

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To find the molar mass of HCl, add the atomic mass of hydrogen (1.01 g/mol) and chlorine (35.45 g/mol) to get 36.46 g/mol.

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Which has a greater molar mass: NH3 or CO2?

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CO2 has a greater molar mass. NH3 (17.03 g/mol) vs. CO2 (44.01 g/mol).

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What is the mass of 1 mole of oxygen gas (O2)?

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The mass of 1 mole of oxygen gas (O2) is 32 grams, as each oxygen atom has an atomic mass of 16 g/mol.

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How do you calculate the mass of a substance from moles?

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To calculate the mass, multiply the number of moles by the molar mass of the substance. For example, 2.50 moles of O2 has a mass of 2.50 x 32 g/mol = 80 g.

Front

What is Avogadro's number?

Back

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

Front

What is the significance of the periodic table in chemistry?

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The periodic table provides essential information about elements, including atomic mass, which is used to calculate molar mass.

Front

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. For example, 36.46 g of HCl is 1 mole.