chem UNIT 5.5 Review: Avogadro's Number

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What is Avogadro's number?

Back

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

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How do you convert moles to number of particles?

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To convert moles to number of particles, multiply the number of moles by Avogadro's number (6.02 x 10^23).

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How do you convert number of particles to moles?

Back

To convert number of particles to moles, divide the number of particles by Avogadro's number (6.02 x 10^23).

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If you have 0.0088 moles of Cu(CN)3, how many particles do you have?

Back

5.3 x 10^21 Cu(CN)3 particles.

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How many moles are in 3.5 x 10^17 molecules of Vitamin C?

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5.81 x 10^-7 moles of Vitamin C.

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If you have 2.4 x 10^24 atoms of platinum, how many moles do you have?

Back

4 moles of platinum.

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What is the formula to convert molecules to grams?

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

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Convert 4.7 x 10^26 NH3 molecules to grams.

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13,268 g NH3.

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What is the molar mass of NH3 (Ammonia)?

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The molar mass of NH3 is approximately 17 g/mol.

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What is the significance of Avogadro's number in chemistry?

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Avogadro's number allows chemists to count particles by weighing them, linking the macroscopic and microscopic worlds.