The molal freezing point depression constant of benzene`(C_(6)H_(6))` is `4.90 K kg mol^(-1)`.
Channel: Doubtnut
Date: 2020-07-12

The molal freezing point depression constant of benzene`(C_(6)H_(6))` is `4.90 K kg mol^(-1)`. Selenium exists as a polymer of the type `Se_(x)`. When `3.26 g` of selenium is dissolved in `226 g` of benzene, the observed freezing point is `0.112^(@)C` lower than pure benzene. Deduce the molecular formula of selenium. (Atomic mass of `Se=78.8 g mol^(-1)`)