If `0.765 g` of an acid gives `0.535 g` of `CO_(2)` and `0.138 g` of `H_(2)O`, then the ratio of the percentage of `C` to `H` is

Options

A. `19 : 2`
B. `18 : 11`
C. `20 : 17`
D. `1 : 7`

Answer

a

Explanation

`%` for `CO_(2)`
`because0.765` g of acid gives `CO_(2)=0.535g`
`therefore100` g of acid gives `CO_(2)=(0.535xx100)/(0.765)`
`%` of `CO_(2)=70.00`
`%` for carbon
`because` 44 g of `CO_(2)` gives , C = 12 g
`therefore70` of `CO_(2)` gives , `C=(12xx70)/(44)`
`=19.09g`
`therefore%` of carbon `=19.00`
Similarly ,
(i) for hydrogen
`%` of `H_(2)O`
`rArr(0.138xx100)/(0.765)`
`=18.03=18.00`
`%` of Hydrogen
`rArr(2xx18)/(18)=2.00`
Hence ratio of carbon and hydrogen is ` 19 : 2`