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A mixture of C(2)H(2) and C(3)H(8) occu...

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 `CO_(2)` and `H_(2)O(l)`. When the pressure of `Co_(2)` was found to be 230 mm Hg at the same temperature and volume, the mole fraction of `CO_(3)H_(8)` in the mixture is :

A

0.125

B

0.875

C

0.6

D

0.8

Text Solution

Verified by Experts

The correct Answer is:
b
(b) Moles of `C_(2)H_(2)` and `C_(3)H_(8)` are a and b
`underset(a)(C_(2)H_(2))+2.5O_(2)rarrunderset(2a)(2CO_(2))+H_(2)O`
`underset(b)(C_(3)H_(8))+5O_(2)rarrunderset(3b)(3CO_(2))+4H_(2)O`
`2a+3b prop 230`
`a+b prop 80`
`b prop70`
`a prop 10`
mole fraction`=(7)/(8)=0.875`
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