The Mole and Molar Mass

A sample of silver contains 5.71 x 10²² atoms. How many moles of silver are present?

• 3.43 x 10⁴⁶ moles

• 0.0529 moles

• 0.0948 moles

• 10.5 moles

Tags

NGSS.HS-PS1-7

How many atoms are present in a 13.5 gram sample of Beryllium?

• 1.5 particles

• 9 particles

• 4.03 x10²³ particles

• 9.02 x10²³ particles

Vitamin C, also known as ascorbic acid, is water soluble and cannot be produced by the human body. Each day, a person's diet should include a source of Vitamin C, such as orange juice. Ascorbic acid has a molecular formula of C₆H₈O₆ and a molar mass of 176 grams per mole.

Determine the number of moles of vitamin C in an orange that contains 0.171 grams of vitamin C.

• 30.1 moles

• 1030 moles

• .000971 moles

• .0001 mole

Tags

NGSS.HS-PS1-7

What is the molar mass of calcium hydroxide, Ca(OH)₂?

• 74.10 g/mol

• 57.10 g/mol

• 58.10 g/mol

• 57.10 g/mol

What is the molar mass of Gold (III) Chloride, AuCl₃?

• 96.33 g

• 130.33 g

• 232.53 g

• 303.33 g

What is the molar mass of zinc acetate, Zn(C₂H₃O₂)₂?

• 392.48 g/mol

• 142.90 g/mol

• 361.00 g/mol

• 183.48 g/mol

Determine the mass of 2.40 moles of C₆H₁₂

• 202 g

• 115 g

• 230. g

• 353 g

What is the mass of a 0.75 mole sample of sulfur dioxide SO₂?

• 16 g

• 24 g

• 32 g

• 48 g

Tags

NGSS.HS-PS1-7

Calculate the mass of iron in a sample of iron ore (rock) containing 2.61x10²³ iron atoms. (Iron is the element symbol Fe)

• 0.433g

• 24.2g

• 44g

• 6.02g

Tags

NGSS.HS-PS1-7

Find the molar mass of: Lead (II) Nitrate

Pb(NO₃)₂

• 241.20 g/mol

• 207.20 g/mol

• 301.50 g/mol

• 331.20 g/mol