A pre weighed vessel was filled with oxygen at N.T.P. and weighted.It was then evacuated, filled with `SO_(2)` at the same temperature and pressure, and again weighed. The weight of oxygen will be

Options

A. Same as that of `SO_(2)`
B. `(1)/(2)` that of `SO_(2)`
C. Twice that of `SO_(2)`
D. One -fourth that of `SO_(2)`

Answer

B

Explanation

Under same conditions of temp. and pressure moles of `O_(2) =` moles of `SO_(2)`
`(W)/(32) = (W)/(64)` i.e., Wt. of `O_(2) = (1)/(2)` that of `SO_(2)`