Question

A gaseous mixture of propane and butane of volume 3 litre on complete combustion produces
11.0 litre `CO_(2)` under standard conditions of temperature and pressure.
The ration of volume of butane to propane is:
A. `1:2`
B. `2:1`
C. `3:2`
D. `3:1`

Answer 1

Correct Answer - B
`C_(3)H_(8) +5O_(2) rarr 3CO_(2)+4H_(2)O`
x litres of propane produce `3x` litre of `CO_(2)`
`C_(4)H_(10) +6.5O_(2) rarr 4CO_(2) +5H_(2)O`
(3-x) litres of butane produce `4(3-x)` lit of `CO_(2)`
`3x +4 (3-x) = 11, 3x + 12 - 4x = 11`
`12 - x = 11, x = 1` litre
volume of butane: propane `= 2:1`