Syllabus Edition

First teaching 2023

First exams 2025

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The Mole & the Avogadro Constant (CIE AS Chemistry)

Exam Questions

43 mins13 questions
11 mark

What is the mass of 0.56 moles of potassium dichromate (VI), K2Cr2O7?

  • 79.52 g

  • 164.75 g

  • 525.36 g

  • 155.79 g

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21 mark

Ethane has the formula C2H6.

What is the mass in grams of one molecule of ethane? (Ar: C = 12.0; H = 1.0)

(the Avogadro constant L = 6.023 x 1023)

  • 1.81 x 1025

  • 5.00 x 10-23

  • 30.0

  • 3.00 x 10-23

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31 mark

How many molecules of nitrogen gas are in 4.00 g?

(the Avogadro constant L = 6.023 x 1023)

  • 8.61 x 1022

  • 4.22 x 1024

  • 6.75 x 1025

  • 1.75 x 1023

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11 mark

The mass of a coin is 20% nickel. The coin has a mass of 10.0 g.

How many nickel atoms are in the coin?

  • 4.30 x 1022

  • 1.03 x 1023

  • 1.20 x 1024

  • 2.05 x 1022

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21 mark

A coin contains 5.921% nickel by mass. If the coin weighs 9.97 g, how many nickel atoms are in the coin?

  • 4.30 x 1022

  • 3.01 x 1023

  • 6.02 x 1025

  • 6.02 x 1021

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3
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1 mark

Which sample contains the greatest number of molecules?

  • 1 g of methanal, CH2O

  • 2 g of carbon dioxide, CO2

  • 3 g of sulfur, S6

  • 4 g of bromine, Br2

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11 mark

Which of these substances contains the greatest number of atoms?

  • 113 mg of chlorine

  • 1.32 × 10-4 kg of sulfur

  • 92.0 mg of ammonia

  • 1.69 × 10−4 kg of methane

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21 mark

A gas cylinder for a portable heater contains 13 kg of butane.

How many butane molecules are in the gas cylinder?

The Avogadro’s constant, L = 6.022 x 1023 mol-1

  • 1.35 x 1026

  • 2.69 x 1024

  • 1.40 x 1026

  • 3.72 x 10-22

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3
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1 mark

Which mass of substance contains the greatest number of atoms?

  • 3.00 g of ammonia

  • 3.00 g of chloromethane

  • 4.00 g of hydrogen sulfide

  • 4.00 g of hydrogen chloride

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