1.

By dissolving 5 g substance in 50 g of water, the decrease in freezing point is 1.2^(@)C. The gram molal depression is 1.85^(@)C. The molecular weight of substance is

Answer»

`105.4`
`118.2`
`137.2`
`154.2`

Solution :We know that, `m=(1000 K_(F)XX W)/(DELTA TW)`
Here, `Delta T=1.2^(@)C, K_(f)=1.85^(@)`
`w=5g, W=50 g`
`m=(1000xx1.85xx5)/(1.2xx50)=154.2`.


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