A gaseous hydrocarbon X, was burnt in excess of oxygen. A `0.112 dm^(3)` sample of X, at STP gave `0.88 g""CO_(2)`. How many C - atoms are there in one molecule of X?

Options

A. `1`
B. `2`
C. `3`
D. `4`

Answer

D

Explanation

`C_(x)H_(y)(g)+(x+(y)/(4))O_(2)(g) rarr xCO_(2)(g) +(y)/(2)H_(2)O(l)`
`m` moles of hydrocarbon `=(0.112)/(22.4)xx10^(3)=5`
number of carbondioxide formed `=5x`
`therefore 5x=(0.88xx1000)/(44)=20" "x=4`