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Lesson: Masses and Moles

Worksheet • 9 Questions

Q1:

There is approximately 1 g of graphite in a pencil. How many moles of carbon atoms are there in 1.0 g of graphite?

Q2:

Which of the following is furthest from a mole of molecules/formula units?

  • A 79.90 g bromine gas
  • B 16.04 g methane
  • C 100.09 g calcium carbonate
  • D 154.99 g cobalt(II) sulfate
  • E 20.01 g hydrogen fluoride

Q3:

Which of the following is furthest from a mole of atoms?

  • A 7.023 g L i
  • B 24.305 g M g
  • C 79.904 g B r 2
  • D 10.81 g B
  • E 15.999 g O 2

Q4:

Which of the following contains the greatest number of moles of oxygen atoms?

  • A 1 . 5 m o l H C O H 2
  • B 1 . 7 m o l H C O 2
  • C 1 . 0 m o l H O 2
  • D 2 . 5 m o l C H C H O H 3 2
  • E 2 . 0 m o l C H O H 3

Q5:

Which of these has the greatest mass?

  • A 1 m o l S 8
  • B 1 m o l P 4
  • C 1 m o l H 2
  • D 1 m o l F 2
  • E 1 m o l B r 2

Q6:

When 10.00 g of water partially evaporates, 1 0 2 2 water molecules are removed as vapor. Calculate the mass of water remaining.

Q7:

Calcium carbonate has the formula C a C O 3 .

What is the mass of one mole of calcium carbonate to the nearest gram?

What is the mass of one formula unit of calcium carbonate to 3 significant figures?

  • A 1 . 6 6 × 1 0 2 2 g
  • B 1 . 3 3 × 1 0 2 2 g
  • C 6 . 0 3 × 1 0 2 1 g
  • D 1 . 1 3 × 1 0 2 2 g
  • E 1 . 0 0 × 1 0 2 1 g

Calculate to 3 significant figures the number of moles present in 500 g of pure calcium carbonate.

Q8:

Which of the following represents the greatest mass?

  • A 3 mol of calcium
  • B 80 L of oxygen gas at 1.00 bar and 298 K
  • C 110 g of calcium
  • D 2 . 0 0 × 1 0 2 4 molecules of oxygen gas
  • E 2.00 mol of calcium oxide

Q9:

A packet of an artificial sweetener contains 40.0 mg of saccharin ( C H N O S ) 7 5 3 , which has the structural formula:

C C H C H C H C C H S C O N O O H

Saccharin has a molar mass of 183.18 g/mol.

How many saccharin molecules are there in the packet of artificial sweetener?

  • A 1 . 3 2 × 1 0 2 0
  • B 2 . 2 0 × 1 0 2 0
  • C 1 . 5 9 × 1 0 2 0
  • D 1 . 2 0 × 1 0 2 0
  • E 1 . 4 9 × 1 0 2 0

How many carbon atoms are there in this quantity of saccharin?

  • A 9 . 2 1 × 1 0 2 0
  • B 1 . 5 4 × 1 0 2 1
  • C 1 . 1 2 × 1 0 2 1
  • D 8 . 4 0 × 1 0 2 0
  • E 1 . 0 5 × 1 0 2 1
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