A chemist was investigating the best way to produce 1 , 2 -dichloroethane. She reacted ethane with chlorine in the presence of UV light by the following reaction: C 2 H 6 ( g ) + 2 Cl 2 ( g ) → C 2 H 4 CI 2 ( l ) + 2 HCI ( g ) After doing this she found that 600 g of ethane gave 148 . 5 g of C 2 H 4 Cl 2 . Calculate how many moles of 1 , 2 -dichloroethane are there in 148 . 5 g .

M r of C 2 H 4 Cl 2 is 2 × 12 u + 4 × 1 u + 2 × 35 . 5 u = 98 u . Hence its gram M r is 98 g . Number of moles of C 2 H 4 Cl 2 in its 148 . 5 g = 148 . 5 g 98 g = 1 . 5 mol

MEDIUM

AS and A Level

IMPORTANT

Earn 100

Give the empirical formula for both the structural isomers of methylpropene.

Important Questions on Introduction to Organic Chemistry

HARD

AS and A Level

IMPORTANT

Chemistry for Cambridge International AS & A Level Coursebook with Digital Access (2 Years)>Chapter 14 - Introduction to Organic Chemistry>BEFORE YOU START>Q 2

Give the shape of a methane,

{CH}_{4}

, molecule and the

H — C — H

bond angles.

HARD

AS and A Level

IMPORTANT

Chemistry for Cambridge International AS & A Level Coursebook with Digital Access (2 Years)>Chapter 14 - Introduction to Organic Chemistry>BEFORE YOU START>Q 4

Which two of the following are true about a molecule of ethene,

C_{2} H_{4}

MEDIUM

AS and A Level

IMPORTANT

Chemistry for Cambridge International AS & A Level Coursebook with Digital Access (2 Years)>Chapter 14 - Introduction to Organic Chemistry>Question>Q 1

On analysis, a hydrocarbon was found to contain

0.72 g

of carbon and

0.18 g

of hydrogen. Calculate the empirical formula of the hydrocarbon.

HARD

AS and A Level

IMPORTANT

Chemistry for Cambridge International AS & A Level Coursebook with Digital Access (2 Years)>Chapter 14 - Introduction to Organic Chemistry>Question>Q 1

On analysis, a hydrocarbon was found to contain

0.72 g

of carbon and

0.18 g

of hydrogen. Further investigation showed that the relative molecular muss of the hydrocarbon was

30

. Deduce its molecular formula.

MEDIUM

AS and A Level

IMPORTANT

Chemistry for Cambridge International AS & A Level Coursebook with Digital Access (2 Years)>Chapter 14 - Introduction to Organic Chemistry>Question>Q 1

A compound contains the elements carbon, hydrogen and oxygen. Its empirical formula is

{CH}_{2} O

and its relative molecular mass is

60

. Deduce the molecular formula of the compound.

MEDIUM

AS and A Level

IMPORTANT

Chemistry for Cambridge International AS & A Level Coursebook with Digital Access (2 Years)>Chapter 14 - Introduction to Organic Chemistry>Question>Q 1

Draw the displayed formula of ethene (molecular formula

C_{2} H_{4}

MEDIUM

AS and A Level

IMPORTANT

Chemistry for Cambridge International AS & A Level Coursebook with Digital Access (2 Years)>Chapter 14 - Introduction to Organic Chemistry>Question>Q 1

Draw the displayed formula of propane (molecular formula

C_{3} H_{8}

MEDIUM

AS and A Level

IMPORTANT

Chemistry for Cambridge International AS & A Level Coursebook with Digital Access (2 Years)>Chapter 14 - Introduction to Organic Chemistry>EXAM-STYLE QUESTIONS>Q 5

A chemist was investigating the best way to produce $1, 2$ -dichloroethane. She reacted ethane with chlorine in the presence of UV light by the following reaction:

$C_{2} H_{6} (g) + 2 {Cl}_{2} (g) \to C_{2} H_{4} {CI}_{2} (l) + 2 HCI (g)$

After doing this she found that $600 g$ of ethane gave $148.5 g$ of $C_{2} H_{4} {Cl}_{2}$ . Calculate how many moles of $1, 2$ -dichloroethane are there in $148.5 g$ .

Give the empirical formula for both the structural isomers of methylpropene.

Important Questions on Introduction to Organic Chemistry

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