Avogadro's Number

Why is the mass of one mole of a substance numerically equal to its molar mass in grams?

• The mass of one mole of a substance is numerically equal to its molar mass in grams due to the substance's taste

• The mass of one mole of a substance is numerically equal to its molar mass in grams because of the substance's odor

• The mass of one mole of a substance is numerically equal to its molar mass in grams due to the definition of the mole being based on the number of entities in 12 grams of carbon-12.

• The mass of one mole of a substance is numerically equal to its molar mass in grams because of the color of the substance

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NGSS.HS-PS1-7

What is Avogadro's number?

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NGSS.HS-PS1-7

How many water molecules are in 5.2 moles of water?

• 6.0 x 10²³ molecules

• 5.2 molecules

• 3.1 x 10²⁴ molecules

• 8.6 x 10^-24 molecules

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NGSS.HS-PS1-7

How many molecules of diphosphorus pentachloride are in exactly 1 mole of P₂Cl₅?

• 2 atoms

• 5 atoms

• 2 moles

• 5 moles

• 6.022 x 10²³ molecules

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NGSS.HS-PS1-7

Avogadro’s number is:

• 6.02 x 10²²

• 6

• 6.02 x 10²³

• 3.01 x 10²³

How many molecules are in 2.5 mol of NaCl?

• 51x10²³

• 146

• 4.15

• 1.51x10²⁴

How many atoms of carbon are in 6.00g of carbon?

• 20x10²⁴atoms C

• 6.02x10²³atoms C

• 3.01x10²³atoms C

• 1.50x10²³atoms C

To change mass to atoms, how many conversion factors would need to be used?

• 2

• 3

• 1

• 5

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NGSS.HS-PS1-7

To convert moles to mass one would

• multiply moles given by the molar mass in grams

• divide the moles given by the molar mass in grams

• simply use the molar mass for the given substance

• multiply the average atomic mass by the molar mass

How many atoms are in 9.44 moles of Al?

• 5.68 atomsAl

• 5.68x10²⁴ atoms Al

• 0.705 atoms Al

• 1.25x10²³ atoms Al