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A mixture of {C}_{{{2}}}{H}_{{{2}}} and {C}_{{{3}}}{H}_{{{8}}}

Question

A mixture of $C_{2} H_{2}$ and $C_{3} H_{8}$ occupied a certain volume at 80 mm Hg. The mixture was completely burnt to $C O_{2}$ and $H_{2} O (l)$ . When the pressure of $C o_{2}$ was found to be 230 mm Hg at the same temperature and volume, the mole fraction of $C O_{3} H_{8}$ in the mixture is :

0.125

0.875

0.6

0.8

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Theodore Discussed

A mixture of

C_{2} H_{2}

and

C_{3} H_{8}

occupied a certain volume at 80 mm Hg. The mixture was completely burnt to

C O_{2}

and

H_{2} O (l)

. When the pressure of

C o_{2}

was found to be 230 mm Hg at the same temperature and volume, the mole fraction of

C O_{3} H_{8}

in the mixture is :

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Text solutionVerified

Answer: bSolution: (b) Moles of

C_{2} H_{2}

and

C_{3} H_{8}

are a and b

a C_{2} H_{2} + 2.5 O_{2} \to 2 a 2 C O_{2} + H_{2} O

b C_{3} H_{8} + 5 O_{2} \to 3 b 3 C O_{2} + 4 H_{2} O

2 a + 3 b \propto 230

a + b \propto 80

b \propto 70

a \propto 10

mole fraction

= \frac{7}{8} = 0.875

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Question Text	A mixture of $C_{2} H_{2}$ and $C_{3} H_{8}$ occupied a certain volume at 80 mm Hg. The mixture was completely burnt to $C O_{2}$ and $H_{2} O (l)$ . When the pressure of $C o_{2}$ was found to be 230 mm Hg at the same temperature and volume, the mole fraction of $C O_{3} H_{8}$ in the mixture is :
Answer Type	Text solution:1
Upvotes	150