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The latent heat of vaporisation of water is 9700 cal/mole and if the b.p. is 100 °C, the ebullioscopic constant of water is

A.0.516 °C kg/mol✓ Correct

B.1.026 °C kg/mol

C.10.26 °C kg/mol

D.1.832 °C kg/mol

Explanation

The ebullioscopic constant is given by: 2 1000 x b b RT K L Here, R = gas constant T = boiling point 100 273 373K L= latent heat of vapourisation in (cal/gm) 2 9700 / 18 2 (373) 18 1000 970 516 0 /

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