Ethane burns in oxygen to form C O 2 and H 2 O according to the equation, 2 C 2 H 6 + 7 O 2 → 4 C O 2 + 6 H 2 O If 1 250 c c of oxygen is burnt with 300 c c of ethane. Calculate the volume of unused O 2 .

2 C 2 H 6 + 7 O 2 → 4 CO 2 + 6 H 2 O In the balance equation given, the number of moles of oxygen is 3 . 5 times the number of moles of ethane. Hence, the volume of oxygen will also be 3 . 5 times the amount of ethane. To burn 300 cc of ethane, the amount of oxygen needed = 3 . 5 × 300 = 1050 cc The amount of oxygen burnt with 300 cc of ethane in the given question= 1250 cc Hence, the amount of unused oxygen 1250 - 1050 cc = 200 cc of oxygen.

Ethane burns in oxygen to form C O 2 and H 2 O according to the equation, 2 C 2 H 6 + 7 O 2 → 4 C O 2 + 6 H 2 O If 1 250 c c of oxygen is burnt with 300 c c of ethane. Calculate the volume of unused O 2 .

2 C 2 H 6 + 7 O 2 → 4 CO 2 + 6 H 2 O In the balance equation given, the number of moles of oxygen is 3 . 5 times the number of moles of ethane. Hence, the volume of oxygen will also be 3 . 5 times the amount of ethane. To burn 300 cc of ethane, the amount of oxygen needed = 3 . 5 × 300 = 1050 cc The amount of oxygen burnt with 300 cc of ethane in the given question= 1250 cc Hence, the amount of unused oxygen 1250 - 1050 cc = 200 cc of oxygen.

Propane burns in air according to the following equation C 3 H 8 + 5 O 2 → 3 C O 2 + 4 H 2 O . What volume of propane is consumed on using 1000 c m 3 of air considering only 20 % of air contains oxygen?

C 3 H 8 + 5 O 2 → 3 C O 2 + 4 H 2 O Volume of air = 1000 c m 3 ; % of oxygen in air = 20 % Since, only 20 % of oxygen is present in 1000 cm 3 , the volume of oxygen in air = 20 100 × 1000 = 200 cm 3 The volume of propane burnt for every 200 c m 3 of oxygen = 1 5 × 200 = 40 c m 3 .

Ethane burns in oxygen to form C O 2 and H 2 O according to the equation, 2 C 2 H 6 + 7 O 2 → 4 C O 2 + 6 H 2 O If 1 250 c c of oxygen is burnt with 300 c c of ethane. Calculate the volume of C O 2 formed.

2 C 2 H 6 + 7 O 2 → 4 C O 2 + 6 H 2 O According to the above reaction where ethane burns in the presence of oxygen, 2 volumes of ethane reacts with oxygen to give 4 volumes of carbon dioxide. This means the volume of carbon dioxide formed is two times the volume of ethane. So the volume of carbon dioxide formed from 300 cc of ethane would be two times the amount of ethane = ( 300 × 2 ) cc Therefore, the amount of carbon dioxide formed from 300 cc of ethane is 600 cc .

E M B I B E

All in One - ICSE Chemistry>Chapter 5 - Mole Concept and Stoichiometry>ARCHIVES*(Last 7 Years)>Q 2

HARD

10th ICSE

IMPORTANT

Earn 100

Ethane burns in oxygen to form ${C O}_{2}$ and $H_{2} O$ according to the equation,
$2 C_{2} H_{6} + 7 O_{2} \to 4 C O_{2} + 6 H_{2} O$
If $1250 c c$ of oxygen is burnt with $300 c c$ of ethane. Calculate the volume of unused $O_{2}$ .

Important Questions on Mole Concept and Stoichiometry

HARD

10th ICSE

IMPORTANT

All in One - ICSE Chemistry>Chapter 5 - Mole Concept and Stoichiometry>ARCHIVES*(Last 7 Years)>Q 3

Propane burns in air according to the following equation
$C_{3} H_{8} + 5 O_{2} \to 3 {C O}_{2} + 4 H_{2} O$ .

What volume of propane is consumed on using $1000 {c m}^{3}$ of air considering only $20 %$ of air contains oxygen?

MEDIUM

10th ICSE

IMPORTANT

All in One - ICSE Chemistry>Chapter 5 - Mole Concept and Stoichiometry>ARCHIVES*(Last 7 Years)>Q 3

The mass of

11.2 L

of a certain gas at

S T P

is

24 g

. Find the gram molecular mass of the gas.

MEDIUM

10th ICSE

IMPORTANT

All in One - ICSE Chemistry>Chapter 5 - Mole Concept and Stoichiometry>ARCHIVES*(Last 7 Years)>Q 4

A gas cylinder can hold

1 k g

of hydrogen at room temperature and pressure. Find the number of moles of hydrogen present.

HARD

10th ICSE

IMPORTANT

All in One - ICSE Chemistry>Chapter 5 - Mole Concept and Stoichiometry>ARCHIVES*(Last 7 Years)>Q 4

A gas cylinder can hold

1 k g

of hydrogen at room temperature and pressure.
What weight of

{C O}_{2}

can the cylinder hold under similar conditions of temperature and pressure?

(H = 1, C = 12, O = 16)

HARD

10th ICSE

IMPORTANT

All in One - ICSE Chemistry>Chapter 5 - Mole Concept and Stoichiometry>ARCHIVES*(Last 7 Years)>Q 4

A gas cylinder can hold $1 kg$ of hydrogen at room temperature and pressure.
(i) If the number of molecules of hydrogen in the cylinder is $X$ , calculate the number of ${C O}_{2}$ molecules in the cylinder under the same conditions of temperature and pressure.

(ii) State the law that helped you to arrive at the above result.

MEDIUM

10th ICSE

IMPORTANT

All in One - ICSE Chemistry>Chapter 5 - Mole Concept and Stoichiometry>ARCHIVES*(Last 7 Years)>Q 5

Calculate the number of gram atom in