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Counting Particles by Mass: The Mole (DP IB Chemistry: SL): Exam Questions

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Counting Particles by Mass: The Mole

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1
Sme Calculator1 mark

A compound has an empirical formula of C2H6O and a molar mass of 92.16.

What is the molecular formula of this compound?

  • C2H6O 

  • C4H12O2

  • C6H18O3

  • C8H24O4

Choose your answer

2
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Ethane has the formula C2H6. What is the mass in grams of one molecule of ethane?

  • 1.8 x 1025

  • 3.0 x 10-23

  • 30.0

  • 5.0 x 10-23

Choose your answer

31 mark

Shown below are four molecular formulas. Which one is also an empirical formula?

  • PCl5

  • CH3COOH

  • H2O2

  • C6H12O6

Choose your answer

41 mark

The relative atomic mass is a way of representing the mass of an atom.

What is the standard reference used for the relative atomic mass scale?

  • the mass of an electron

  • 1/12 the mass of a carbon-12 atom

  • the mass of a hydrogen-1 atom

  • the mass of a proton

Choose your answer

5
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Which of the following shows the relative formula mass of ammonium sulfate, (NH4)2SO4? 

  • 70.00

  • 132.00

  • 114.09

  • 132.17

Choose your answer

6
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Which amount of the following substances contains the smallest quantity of ions?

  • 2 mol of KOH  

  • 1 mol of NH4Br

  • 2 mol of MgCl2

  • 1 mol of Fe2O3

Choose your answer

7
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A sample of hydrated calcium sulfate, CaSO4∙xH2O, has a relative formula mass of 172.19

What is the value of x ?

  • 1

  • 2

  • 3

  • 4

Choose your answer

1
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Analysis of a 46.0 g sample of a compound with a molar mass of 92.0 g mol⁻¹ showed it contained 12.0 g of carbon, 2.0 g of hydrogen, and 32.0 g of oxygen.

What is the molecular formula of the compound?

  • CH2O2

  • CH2O

  • C2H4O2

  • C2H4O4

Choose your answer

2
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Ethanoic acid has the formula CH3COOH. How many carbon atoms are present in 0.1 mol of ethanoic acid?

  • 6.0 x 1022

  • 1.2 x 1023

  • 6.0 x 1023

  • 1.2 x 1024

Choose your answer

31 mark

A compound contains carbon and hydrogen only. The amount of carbon is 80% by mass. What is the empirical formula of the compound?

  • CH

  • CH2

  • CH3

  • CH4

Choose your answer

4
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A hydrated carbonate of an unknown Group 1 metal has the formula X2CO3∙10H2O and is found to have a relative formula mass of 286.19                              

What is the Group 1 metal?

  • Rb

  • K

  • Na

  • Li

Choose your answer

51 mark

The diagram below shows the skeletal formula of phenazine.

1-1-m-q9-ib-chemistry-mcqs

What is the empirical formula of phenazine?

  • C6H6N

  • C12H8N2

  • C6H4N

  • C12H12N2

Choose your answer

6
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A coin contains 5.869% nickel by mass. If the coin weighs 10.00g, how many nickel atoms are in the coin?

  • 4.30 x 1022

  • 3.01 x 1023

  • 6.02 x 1025

  • 6.02 x 1021

Choose your answer

11 mark

10 cm3 of methane and 10 cm3 of ethane were sparked with an excess of oxygen. Once cooled, the remaining gas was passed through aqueous potassium hydroxide, which absorbs carbon dioxide.

Assume all measurements were taken at 25˚C and 1 atm pressure. 

What volume of gas is absorbed by the alkali?

  • 45 cm3

  • 30 cm3

  • 20 cm3

  • 10 cm3

Choose your answer

2
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Which sample contains the largest amount, in mol, of atoms?

  • 0.30 mol of P2O5

  •  0.40 mol of CuSO4.5H2O

  • 0.50 mol of CH3COOH

  • 0.90 mol of H2O

Choose your answer

3
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How many ions are present in 0.02 mol of (NH4)3PO4?

  • 8.0 x 10-2

  • 1.2 x 1022

  • 4.8 x 1022

  • 2.4 x 1023

Choose your answer