CAIE IGCSE Chemistry 3.3 The Mole and the Avogadro Constant Topic Practice

Question 1

[Maximum number: 1]

Benzene is a liquid with molecular formula C6H6\mathrm{C}_{6} \mathrm{H}_{6}.
Ethene is a gas with molecular formula C2H4\mathrm{C}_{2} \mathrm{H}_{4}.
Which statement is correct?

A

1 mole of benzene and 1 mole of ethene contain the same number of atoms.

B

1 mole of benzene and 1 mole of ethene both have a volume of 24dm324 \mathrm{dm}^{3} at room temperature and pressure.

C

Both benzene and ethene have the same empirical formula.

D

The number of carbon atoms in 0.5 moles of ethene is equal to the Avogadro constant.

Question 2

[Maximum number: 1]

Magnesium chloride, MgCl2\mathrm{MgCl}_{2}, contains magnesium ions and chloride ions.
How many chloride ions are present in two moles of magnesium chloride?

A

6.02×10236.02 \times 10^{23}

B

1.204×10241.204 \times 10^{24}

C

2.408×10242.408 \times 10^{24}

D

3.612×10243.612 \times 10^{24}

Question 3

[Maximum number: 1]

What is the volume of 14.5 g of gaseous butane, C4H10\mathrm{C}_{4} \mathrm{H}_{10}, at room temperature and pressure?

A

96.0 cm396.0 \mathrm{~cm}^{3}

B

6.0 cm36.0 \mathrm{~cm}^{3}

C

96.0dm396.0 \mathrm{dm}^{3}

D

6.0dm36.0 \mathrm{dm}^{3}

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