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 ) → Cl - CH 2 - CH 2 - CI ( l ) + 2 HCl ( g ) After doing this she found that 600 g of ethane gave 148 . 5 g of C 2 H 4 Cl 2 . Deduce how many moles of 1 , 2 -dichloroethane would have been formed if the yield had been 100 % .

C 2 H 6 ( g ) + 2 Cl 2 ( g ) → C 2 H 4 Cl 2 ( l ) + 2 HCl ( g ) From the reaction, it is clear that one mole of ethane produces one mole of C 2 H 4 Cl 2 . For 100 % yield the value for actual yield and theoretical yield is the same. Since there are 20 moles in 600 g of ethane. Therefore 20 moles of C 2 H 4 Cl 2 must be produced.

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 ) → Cl - CH 2 - CH 2 - CI ( l ) + 2 HCl ( g ) After doing this she found that 600 g of ethane gave 148 . 5 g of C 2 H 4 Cl 2 . Deduce how many moles of 1 , 2 -dichloroethane would have been formed if the yield had been 100 % .

C 2 H 6 ( g ) + 2 Cl 2 ( g ) → C 2 H 4 Cl 2 ( l ) + 2 HCl ( g ) From the reaction, it is clear that one mole of ethane produces one mole of C 2 H 4 Cl 2 . For 100 % yield the value for actual yield and theoretical yield is the same. Since there are 20 moles in 600 g of ethane. Therefore 20 moles of C 2 H 4 Cl 2 must be produced.

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

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 the percentage yield of 1 , 2 -dichloroethane.

C 2 H 6 ( g ) + 2 Cl 2 ( g ) → C 2 H 4 CI 2 ( l ) + 2 HCI ( g ) M r of ethane is 30 u and that of C 2 H 4 Cl 2 is 2 × 12 u + 4 × 1 u + 2 × 35 . 5 u = 98 u . Hence, their gram M r are 30 g and 98 g respectively. 600 g of ethane gave 148 . 5 g of C 2 H 4 Cl 2 . 20 mol of ethane gave 1 . 5 mol of C 2 H 4 Cl 2 . From the reaction, it is clear that one mole of ethane produces one mole of C 2 H 4 Cl 2 . Hence, 20 mol of ethane produces 20 mol of C 2 H 4 Cl 2 . % yield = 1 . 5 mol 20 mol × 100 = 7 . 5 %

A chemist was investigating the best way to produce 1 , 2 -dichloroethane. She reacted ethene with chlorine in the dark by the following reaction: C 2 H 4 ( g ) + 2 Cl 2 ( g ) → C 2 H 4 CI 2 ( l ) In this reaction 140 g of ethene gave 396 g of C 2 H 4 Cl 2 . Calculate the percentage yield for this reaction. Show your working.

C 2 H 4 ( g ) + 2 Cl 2 ( g ) → C 2 H 4 CI 2 ( l ) From the reaction, it is clear that one mole of ethene produces one mole of 1 , 2 -dichloroethane. Number of moles in 140 g ethene = 140 g 28 g = 5 mol 5 mol of ethene must produce 5 mol of 1 , 2 -dichloroethane. Number of moles in 396 g of C 2 H 4 CI 2 = 396 g 99 g = 4 mol . Experimentally, 5 mol of ethene produces 4 mol of C 2 H 4 CI 2 . % yield = 4 mol 5 mol × 100 = 80 %

HARD

AS and A Level

IMPORTANT

Earn 100

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:

$C_{2} H_{6} (g) + 2 {Cl}_{2} (g) \to Cl - {CH}_{2} - {CH}_{2} - CI (l) + 2 HCl (g)$

After doing this she found that $600 g$ of ethane gave $148.5 g$ of $C_{2} H_{4} {Cl}_{2}$ . Deduce how many moles of $1, 2$ -dichloroethane would have been formed if the yield had been $100 %$ .

Important Questions on Introduction to Organic Chemistry

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 $148.5 g$ .

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>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 the percentage yield of $1, 2$ -dichloroethane.

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>EXAM-STYLE QUESTIONS>Q 5

A chemist was investigating the best way to produce $1, 2$ -dichloroethane. She reacted ethene with chlorine in the dark by the following reaction:

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

In this reaction $140 g$ of ethene gave $396 g$ of $C_{2} H_{4} {Cl}_{2}$ . Calculate the percentage yield for this reaction. Show your working.

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

There are some structural isomers of the compound

C_{2} H_{4} {Cl}_{2}

. Draw the displayed formulae of the isomers and name them.

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:

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

Name the type of reaction.

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 ethene with chlorine in the dark by the following reaction:

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

Name the type of reaction.

Important Questions on Introduction to Organic Chemistry

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