Number of Particles, Moles and Molar Mass

Which of the following would have more mass?

• mole of Li

• mole of Au

• mole of Si

• None, all are equal

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 mass of 0.75 moles of ammonium phosphate?

• 0.0044 g

• 91 g

• 110 g

• 74 g

Which has more molecules?

• mole H₂O

• mole Al(OH)₃

• mole NaCl

• There are all the same

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

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

Determine the mass of 2.40 moles of C₆H₁₂

• 201 g

• 115 g

• 230. g

• 353 g

A lump of MgO consists of 100 moles. What is the mass in grams?

(a)  

How many molecules are in 6 mole of hydrogen sulfate?

• 6.02x10²³ FU

• 6.02x10¹³⁸ FU

• 5.90x10²⁵ FU

• 3.61x10²⁴ FU

A bag of fertiliser contains 14.52 kg of ammonium nitrate (NH₄NO₃). Calculate the number of moles of ammonium nitrate in the bag of fertiliser.

_{Give your answer to 1d.p}

(a)