SATHEE: Some Basic Concepts Of Chemistry Question 81

Some Basic Concepts Of Chemistry Question 81

Question: An ideal gaseous mixture of ethane $(C_{2} H_{5})$ and ethene $(C_{2} H_{4})$ occupies 28 litre at 1 atm and 273 K. The mixture reacts completely with 128 g $O_{2}$ to produce $C O_{2}$ and $H_{2} O$ . Mole fraction at $C_{2} H_{6}$ in the mixture is:

Options:

A) 0.6

B) 0.4

C) 0.5

D) 0.8

Show Answer

Answer:

Correct Answer: B

Solution:

[b] $C_{2} H_{6} + 3.5 O_{2} \overset{}{\to} 2 C O_{2} + 3 H_{2} O;$

$C_{2} H_{4} + 3 O_{2} \overset{}{\to} 2 C O_{2} + 2 H_{2} O$ Let volume of ethane is x litre, $22.4 \times 4 = 3.5 x + 3 (28 - x)$

$\Rightarrow x = 11.2$ litre at constant T and P, $V \propto n$ :

$\Rightarrow$ Mole fraction of $C_{2} H_{6}$ in mixture $= \frac{11.2}{28} = 0.4$

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Some Basic Concepts Of Chemistry Question 81

Question: An ideal gaseous mixture of ethane (C2H5) and ethene (C2H4) occupies 28 litre at 1 atm and 273 K. The mixture reacts completely with 128 g O2 to produce CO2 and H2O . Mole fraction at C2H6 in the mixture is:

Options:

Answer:

Solution:

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Question: An ideal gaseous mixture of ethane $(C_{2} H_{5})$ and ethene $(C_{2} H_{4})$ occupies 28 litre at 1 atm and 273 K. The mixture reacts completely with 128 g $O_{2}$ to produce $C O_{2}$ and $H_{2} O$ . Mole fraction at $C_{2} H_{6}$ in the mixture is: