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एक यौगिक के 4.00 g को जल के 200 g में घोलने पर विलयन का क्वथनांक एक वायुमण्डलीय दाब पर 100.065°C हो जाता है। इस यौगिक का अणु भार ज्ञात कीजिए। (जल का मोलल उन्नयन स्थिरांक = 0.531KKg mol-1). 

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विलेय का द्रव्यमान, WB = 4.00 g

विलायक का अणु भार, WA = 200 g

मोलल उन्नयन स्थिरांक, Kb = 0.531 K kg mol-1

∆Tb = 100.065 – 100 = 0.065°C

MB = ?

MB = 163.38 g/mol

विलेय का अणु भार = 163.38 g/mol

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