The specific heat of .an element is 0.031 cal/g/`""^(@)C`. 25.9 gofitreacts with `4 gO_2`. The atomic weight of element is

Options

A. 51.8
B. 207.2
C. 103.6
D. None of these

Answer

B

Explanation

Specific heat `xx`Atomic weight = 6.4
`therefore` Atomic weight =`(6.4)/("Specific heat")`
`=(6.4)/(0.031)=207`
`because` 4 g oxygen combines with 25.9 g metal
`therefore` 8 g oxygen combines with
`=(25.9xx8)/4=51.8g`
The equivalent weight of metal= 51.8
Equivalent weight `xx` Valency =·Atomic weight
`therefore` Valency=`(207)/(51.8)=4`
`therefore` Atomic weight = `4 xx 51.8 = 207.2 `