If equivalent mass of suiphur in `SCl_(2)` is `16 u`, then equivalent mass of `S` in `D_(2)Cl_(2)` will be

Options

A. 16
B. 64
C. 8
D. 32

Answer

4

Explanation

In both the compounds equal number of equivalents of `S` and `Cl` combine with each other.
From the given data (atomic mass of `S` is `32 u` and eq mass of S is `16 u`), we conclude that in `SCl_(2)`, 1 mol of `S` atoms `(mass=32 g)` contains 2 equivalent of `S` as the mass of 1 equivalent is `16 g`. We also notice that in `SCl_(2)`
1 mole of `S` atom combines with 2 moles of `Cl` atoms
or
2 equivalents of `S` combines with 1 mole of `Cl` atoms.
or
1 equivalent of `S` combines with 1 mole of `Cl` atoms.
Thus, 1 mole of `Cl` atoms = 1 equivalent of
`Cl=35.5 g`
Now we consider the compound `S_(2)Cl_(2):`
2 moles of `Cl` atoms combine with 2 moles of `S` atoms
or
2 equivalents of `Cl` combine with 2 moles of `S` atoms
or
1 equivalent of `Cl` combines with 1 mole of `S` atoms.
Thus, 1 mole of `S` =1 equivalent of `S=32g`