A certain substance `A` tetramerizes in water to the extent of `80%`. A solution of `2.5 g` of `A` in `100 g` of water lowers the freezing point by `0.3^(@)C`. The molar mass of `A` is a.`120` , b.`61` ,c.`60` ,d.`62`

A certain substance `A` tetramerizes in water to the extent of `80%`.

1.	A certain substance `A` tetramerizes in water to the extent of `80%`. A solution of `2.5 g` of `A` in `100 g` of water lowers the freezing point by `0.3^(@)C`. The molar mass of `A` is a.`120` , b.`61` ,c.`60` ,d.`62`
Answer» d. `alpha=(1-i)/(1-(1/n))` `0.8=(1-i)/(1-(1/4)) rArr i=0.4` Given that `4A rarr A_(4)` Alternate method to calculate (i) `i=("Number of ions" xxalpha)+(1-alpha)` `=(1/4xx0.8)+(1-0.8) ` [`alpha=80%` or `0.8`] `=0.2+0.2=0.4` `DeltaT=iK_(f)xxm` `0.3=0.4xx1.86xx(W_(B)xx1000)/(Mw_(B)xxW_(A))` `0.3=0.4xx1.86xx(2.5xx1000)/(Mw_(B)xx100) rArr Mw_(B)=62`

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A certain substance `A` tetramerizes in water to the extent of `80%`. A solution of `2.5 g` of `A` in `100 g` of water lowers the freezing point by `0.3^(@)C`. The molar mass of `A` is a.`120` , b.`61` ,c.`60` ,d.`62`

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