The weight of `1 L` of ozonised oxygen at `STP` was found to be `1.5 g`. When `100 mL` of this mixture at `STP` was treated with turpentine oil, the volume was reduced to `90 mL`. The molecular weight of ozone is

Options

A. 49
B. 47
C. 46
D. 47.9

Answer

C

Explanation

Volume of `O_3` in 100 ml of ozonised `O_2`
`=100-90=10ml` (dissolved in turpentine)
Volume of `O_3` in 1 litre of ozonised `O_2=(10xx100)/(100)`
`=100ml`
volume of `O_2` in 1 litre `=1000-100=900ml`
Weight of `900ml` of `O_2` at S`TP=(900xx32)/(22400)`
`=1.286gm`
weight of `100 ml` of `O_3` at STP weighs`=0.214gm`
`22400ml` of `O_3` at STP weghs`=(0.214xx22400)/(100)`
`=47.94gm`
Molecular weight of `O_3=47.94`