CAIE A-Level Chemistry AS 2 Atoms Molecules and Stoichiometry Questions

Practise moving between relative masses, particles, moles, formulae, equations and reacting quantities.

Covered syllabus points

2.1 Relative masses of atoms and molecules 2.2 The mole and the Avogadro constant 2.3 Formulas 2.4 Reacting masses and volumes (of solutions and gases)

[Maximum number: 1]

Which of these samples of gas contains the same number of atoms as 1 g of hydrogen gas?

22 g of carbon dioxide ( $M_{\mathrm{r}}: \mathrm{CO}_{2}, 44$ )

8 g of methane $\left(M_{\mathrm{r}}: \mathrm{CH}_{4}, 16\right)$

20 g of neon ( $M_{\mathrm{r}}: \mathrm{Ne}, 20$ )

8 g of ozone ( $M_{\mathrm{r}}: \mathrm{O}_{3}, 48$ )

[Maximum number: 1]

Which pair of formulae is correct?

$\mathrm{Ag}_{2} \mathrm{CO}_{3}$ and $\left(\mathrm{NH}_{4}\right)_{3} \mathrm{NO}_{3}$

$\mathrm{K}_{2} \mathrm{HCO}_{3}$ and $\mathrm{Zn}_{3}\left(\mathrm{PO}_{4}\right)_{2}$

$\mathrm{AgHCO}_{3}$ and $\mathrm{K}_{3} \mathrm{PO}_{4}$

$\mathrm{ZnCO}_{3}$ and $\left(\mathrm{NH}_{4}\right)_{2} \mathrm{PO}_{4}$

[Maximum number: 1]

Sample X is added to water and made up to a total volume of $200 \mathrm{~cm}^{3}$ . This gives a solution of $0.100 \mathrm{~mol} \mathrm{dm}^{-3} \mathrm{HCl}$ .

What is X ?

$10 \mathrm{~cm}^{3}$ of $1.00 \mathrm{~mol} \mathrm{dm}^{-3} \mathrm{HCl}$

$30 \mathrm{~cm}^{3}$ of $0.90 \mathrm{~mol} \mathrm{dm}^{-3} \mathrm{HCl}$

$50 \mathrm{~cm}^{3}$ of $0.40 \mathrm{~mol} \mathrm{dm}^{-3} \mathrm{HCl}$

$100 \mathrm{~cm}^{3}$ of $0.30 \mathrm{~mol} \mathrm{dm}^{-3} \mathrm{HCl}$

[Maximum number: 1]

Which sodium compound contains 74.2 % by mass of sodium?

sodium carbonate

sodium chloride

sodium hydroxide

sodium oxide

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Covered syllabus points

Question 1

Question 2

Question 3

Question 4