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बेंजीन का क्वथनांक `353.23K` है. `1.80g` अवाष्पशील विलेय को 90g बेंजीन में घोलने पर विलयन का क्वथनांक बदलकर`354.11k` हो जाता है . विलेय के मोलर द्रव्यमान की गणना कीजिए. बेन्ज़ीन के लिए `k_(b)` का मान `2.53K kgmol^(-1)`है .

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क्वथनांक में उन्नयन,
`DeltaT_(b)=354.11K-353.23K=0.88K`
`M_(B)=(K_(b)xxW_(B)xx1000)/(DeltaT_(b)xxW_(A))`
`M_(B)=(2.53kg mol^(-1)xx1.8gxx1000)/(03.88K xx90g)`
`=57.5=58g mol^(-1)`
अतः विलेय का मोलर द्रव्यमान
`M_(B)=58mol^(-1)`

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