Mole Calculations

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

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

How many atoms are present in a 0.0254 mole sample of gold?

• 0.25 atoms

• 1.528 x 10²² atoms

• 4.22 x 10^-25 atoms

• 5 atoms

Which of the following shows the correct setup to determine the number of moles of molecules in a 12.0 gram sample of Cl₂?

• 12/35.5 mole

• 12/71 mole

• 12 moles

• 12 x 35.5 moles

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

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

• 74.1 g/mole

• 57.1 g/mole

• 58.1 g/mole

• 57.1 u

What is the molar mass of AuCl₃?

• 96 g
• 130 g
• 232.5 g
• 303.3 g

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

• 392.8g/mol

• 142.9g/mol

• 361g/mol

• 183.5 g/mol

Determine the mass of 2.40 moles of C₆H₁₂

• 201 g

• 115 g

• 230. g

• 353 g

What is the total mass, in grams, of a 0.75 mole sample of SO₂?

• 16 g

• 24 g

• 32 g

• 48 g