1. Avogadro Calculations tutorial
Higher Chemistry
Avogadro Calculations tutorial

2. Q1 Which of the following contains one mole of neutrons? A. 1g of 1H
B. 1 g of 12C
C. 2g of 24Mg
D. 2g of 22Ne

3. Q2 The Avogadro Constant is the same as the number of
A. molecules in 16g of oxygen
B. electrons in 1g of hydrogen
C. atoms in 24g of carbon
D. ions in 1 litre of sodium chloride solution, concentration 1 mol l-1

4. Q3 Which of the following contains the largest number of molecules?
A. 0.10g of hydrogen gas
B. 0.17g of ammonia gas
C. 0.32g of methane gas
D. 0.35g of chlorine gas

5. Q4
It is now known that protons and neutrons are made up of smaller particles called quarks. Each proton and each neutron contains 3 quarks.
What is the approximate number of quarks in 1g of
carbon-12?
A. 6 x 1023
B. 9 x 1023
C. 1.8 x 1024
D x 1025

6. Q5 The number of moles of ions in 1 mol of copper(II) phosphate is
D. 5

7. Q6 The Avogadro Constant is the same as the number of
A. atoms in 24g of carbon
B. molecules in 16g of oxygen
C. molecules in 2g of hydrogen
D. ions in 1 litre of sodium chloride solution, concentration 1 mol l-1

8. Q7 A. 7g CO B. 32g CH4 C. 4g H2 D. 32g SO2 E. 17g NH3 F. 16g O2
Identify the two gases which contain the same number of atoms.
Answer = C and E

9. Q8 A B C D E F The symbol for the Avogadro Constant is NA.
Identify the true statement(s). A
64.2g of sulphur contains approximately NA atoms B
16.0g of oxygen contains approximately NA molecules C
6.0g of water contains approximately NA atoms D
1.0g of hydrogen contains approximately NA protons E
2.0 litres of 0.50mol l-1 sulphuric acid contains approximately NA hydrogen ions F
1.0 litre of 1.0mol l-1 barium hydroxide solution contains approximately NA hydroxide ions
Answer = C and D

10. Q9 Ionisation energies provide information
about the structure of atoms.
Calculate the number of electrons lost
when one mole of boron atoms is
converted into one mole of boron ions
with a charge of 3+.
1.806 x 1024 electrons

11. Q10 A student heated a compound which
gave off carbon dioxide and water
vapour. The volume of carbon dioxide
collected was 240cm3.
Calculate the number of molecules in this
volume. (Take the molar volume of carbon
dioxide to be 24 litres mol-1.)
6.02 x 1021 molecules

12. Q11
Calculate the number of atoms in 105g
of polonium-210.
3 x 1023