Molar Conversions

What is Avogadro's number?

• 10

• 3.1416

• 1000

• 6.022 x 10²³

Tags

NGSS.HS-PS1-7

How many atoms are in 3 moles of oxygen (O2)?

• 9 x 10⁵⁷

• 1.81 x 10²⁴

• 3 x 10²⁴

• 6 x 10¹⁰

1 mole is equivalent to 6.02 x 10²³ atoms

• False

• True

What is the definition of molar mass?

• number of grams per one mole of a substance

• whole number ratio that is a multiple of a chemical formula

• simplest, whole number ratio of a chemical formula

• 6.02 x 10²³ particles per one mole of a substance

Tags

NGSS.HS-PS1-7

To convert from grams to moles, you should multiply by ....

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How many atoms would be contained in 454 grams of iron (Fe)?

• 6.02x10²³ atoms

• 8.14 atoms

• 4.90x10²⁴ atoms

• 55.85x10²³ atoms

What is the molar mass of calcium chloride (CaCl2)?

• 56.4 g/mol

• 79.0 g/mol

• 111.0 g/mol

• 90.3 g/mol

When converting a mass to moles, what unit must be in the denominator of the conversion factor?

• grams

• moles

• grams/mole

What is the molar mass of aluminum carbonate, Al₂(CO₃)₃?

• 54.99 g/mol

• 233.99 g/mol

• 185.99 g/mol

3.0 moles of sodium hydroxide, NaOH, is equal to what mass?

• about 40 grams

• about 23 grams

• about 120 grams