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

EASY

AS and A Level

IMPORTANT

Earn 100

Look at the mass spectrum of ethanol, $C_{2} H_{5} OH$ . A structural isomer of ethanol is methoxy methane, an ether with the formula ${CH}_{3} {OCH}_{3}$ .

Predict and give the name of the fragment that would appear on the mass spectrum of methoxy methane but does not appear on methanol's mass spectrum.

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 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, $Fe {(OH)}_{2}$ .

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 8

Tin(IV) oxide is reduced to tin by carbon. Carbon monoxide is also formed.

${SnO}_{2} + 2 C \to Sn + 2 CO$

Calculate the mass of carbon that exactly reacts with $14.0 g$ of tin(IV) oxide. Give your answer to $3$ significant figures.

( $A_{r}$ values: $C = 12.0, O = 16.0, Sn = 118.7$ ).