Moles and Avogadro's Number

Explain why Avogadro's number is significant in chemistry.

• Avogadro's number is significant because it allows chemists to relate the amount of substance in moles to the number of particles, enabling calculations in chemical reactions.

• Avogadro's number is used to measure temperature in chemical reactions.

• Avogadro's number defines the weight of a single atom in grams.

• Avogadro's number is significant for calculating the speed of chemical reactions.

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How many moles are in 8.30 X 10²³ molecules of H₂O?

• 1.38 moles

• 2 moles

• 0.5 moles

• 1 mole

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How many molecules are in 0.500 moles of H₂?

• 1.51x10²⁴ molecules

• 3.01x10²³ molecules

• 1.20x10²⁴ molecules

• 2.01 x10²⁴ molecules

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How many moles are in 8.11 X 10²⁰ molecules of CH₄?

• 2.0 moles

• 0.0135 moles

• 0.00135 moles

• 0.135 moles

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Explain how the concept of a mole is used to count atoms in a chemical reaction.

• By measuring the volume of the reactants

• By using the molar mass to convert grams to moles, then using Avogadro's number to find the number of atoms

• By counting each atom individually

• By using the density of the reactants

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• 0.5 moles

• 1 mole

• 2 moles

• 4 moles

• 0.5 moles

• 1 mole

• 2 moles

• 3 moles

• 0.25 moles

• 0.41 moles

• 0.50 moles

• 0.75 moles