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 3

Look at the mass spectrum of ethanoic acid.

Identify the fragment with mass-to-charge ratio of $15$ .

Question Image

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 4

A hydrocarbon has molecular ion peak at mass-to-charge ratio of $84$ (relative abundance $62 %$ ) and an $[M + 1]$ peak with a relative abundance of $4.1 %$ .

How many carbon atoms are in the hydrocarbon?

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 5

List the ions responsible for the

M

[M + 2]

and

[M + 4]

peaks in the mass spectrum of dibromomethane.

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 5

What would be the mass-to-charge ratio and relative abundances of the major peaks with the highest charge-to mass ratios in the mass spectrum of chloroethane?

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 5

How many peaks would you see beyond the molecular ion peak in

1, 1

-dibromoethane? What would be their mass-to-charge rations and abundances relative to the molecular ion? (Ignore peaks due to

{}^{13}C

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}

Look at the mass spectrum of ethanol, C2H5OH. A structural isomer of ethanol is methoxy methane, an ether with the formula CH3OCH3. 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

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