1.

After adding non-volatile solute freezing point of water decreases to -0.186^@C. Calculate DeltaT_b if K_f = 1.86 K kg mol^(-1)and K_b = 0.521 K kg mol^(-1)

Answer»

`0.0521`K
`0.0186` K
`0.521 `K
`1.86` K

SOLUTION :`DeltaT_(f) = T_(f) = T_(f)^(@) - T_(f) = 0 - (-0.186) = 0.186 ^(@)C`
`DeltaT_(f) = K_(f) xx m `
` RARR m = (DeltaT_(f))/(K_(f)) = (0.186)/(1.86) = 0.1 m `
` DeltaT_(b) = K_(b) xx m = 0.521 xx 0.1= 0.0521 K `


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