Chemistry for Cambridge International AS & A Level Coursebook with Digital Access (2 Years)>Chapter 3 - Atoms, Molecules and Stoichiometry>Question>Q 2

EASY

AS and A Level

IMPORTANT

Earn 100

Look at the mass spectrum of germanium, $Ge$

Write isotopic formula for the heaviest isotope of germanium.

Important Questions on Atoms, Molecules and Stoichiometry

EASY

AS and A Level

IMPORTANT

Chemistry for Cambridge International AS & A Level Coursebook with Digital Access (2 Years)>Chapter 3 - Atoms, Molecules and Stoichiometry>Question>Q 2

Look at the mass spectrum of germanium, $Ge$ .

Use the $%$ abundance of each isotope to calculate the relative atomic mass of germanium.

EASY

AS and A Level

IMPORTANT

Chemistry for Cambridge International AS & A Level Coursebook with Digital Access (2 Years)>Chapter 3 - Atoms, Molecules and Stoichiometry>Question>Q 6

Use the

A_{r}

value of sulphur is

32.1

to calculate the amount of substance in moles in

10.7 g

of sulphur atoms.

EASY

AS and A Level

IMPORTANT

Chemistry for Cambridge International AS & A Level Coursebook with Digital Access (2 Years)>Chapter 3 - Atoms, Molecules and Stoichiometry>Question>Q 6

Use the

A_{r}

value of sulphur is

32.1

to calculate the amount of substance in moles in

64.2 g

of sulphur molecules

(S_{8})

.

EASY

AS and A Level

IMPORTANT

Chemistry for Cambridge International AS & A Level Coursebook with Digital Access (2 Years)>Chapter 3 - Atoms, Molecules and Stoichiometry>Question>Q 6

Use these

A_{r}

values

(Fe = 55.8, N = 14.0, O = 16.0)

to calculate the amount of substance in moles in

60.45 g

of anhydrous iron(III) nitrate,

Fe {({NO}_{3})}_{3}

.

EASY

AS and A Level

IMPORTANT

Chemistry for Cambridge International AS & A Level Coursebook with Digital Access (2 Years)>Chapter 3 - Atoms, Molecules and Stoichiometry>Question>Q 6

Use the value of the Avogadro constant

(6.02 \times 10^{23} {mol}^{- 1})

to calculate the total number of atoms in

7.10 g

of chlorine atoms. (

A_{r}

value:

Cl = 35.5

).

EASY

AS and A Level

IMPORTANT

Chemistry for Cambridge International AS & A Level Coursebook with Digital Access (2 Years)>Chapter 3 - Atoms, Molecules and Stoichiometry>Question>Q 7

Use these $A_{r}$ values: $C = 12.0, O = 16.0$ .

Calculate the mass of $20$ moles of carbon dioxide, ${CO}_{2}$ .

EASY

AS and A Level

IMPORTANT

Chemistry for Cambridge International AS & A Level Coursebook with Digital Access (2 Years)>Chapter 3 - Atoms, Molecules and Stoichiometry>Question>Q 7

Use these $A_{r}$ values: $C = 12.0, O = 16.0, Na = 23.0$ .

Calculate the mass of $0.050$ moles of sodium carbonate, ${Na}_{2} {CO}_{3}$ .

EASY

AS and A Level

IMPORTANT

Chemistry for Cambridge International AS & A Level Coursebook with Digital Access (2 Years)>Chapter 3 - Atoms, Molecules and Stoichiometry>Question>Q 7

Use these $A_{r}$ values: $Fe = 55.8, H = 1.0, O = 16.0$ .

Calculate the mass of $5.00$ moles of iron(II) hydroxide, $Fe {(OH)}_{2}$ .