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 ethane are there in 600 g .

M r of ethane is 30 u . Hence, its gram M r is 30 g Number of moles of ethane in its 600 g = 600 g 30 g = 20 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 ) → 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 %

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>EXAM-STYLE QUESTIONS>Q 4

A carbon compound P has the percentage composition $85.7 %$ carbon and $14.3 %$ hydrogen. Its relative molecular mass was found to be $56$ .

Calculate its empirical 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>EXAM-STYLE QUESTIONS>Q 4

A carbon compound P has the percentage composition $85.7 %$ carbon and $14.3 %$ hydrogen. Its relative molecular mass was found to be $56$ .

Calculate its molecular formula.

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 4

A carbon compound P has the percentage composition $85.7 %$ carbon and $14.3 %$ hydrogen. Its relative molecular mass was found to be $56$ .

Write down the names and displayed formulae of all the non-cyclic isomers of compound P which have the following characteristic:

Straight chain

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 4

A carbon compound P has the percentage composition $85.7 %$ carbon and $14.3 %$ hydrogen. Its relative molecular mass was found to be $56$ .

Write down the names and displayed formulae of all the non-cyclic isomers of compound P which have the following characteristic:

Branched chain

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 ethane are there in $600 g$ .

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:

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

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 $100 %$ .

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.

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

Important Questions on Introduction to Organic Chemistry

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