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A 0.0020 M aqueous solution of an ionic compound Co(NH_(3))_(4)(NO_(2))_(2)Cl freeze at - 0.00732^(@)C. Number of moles of ions which 1 mol of ionic compound produces on being dissolved in water will be (K_(f)=1.86^(@)C//m).

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Solution :The NUMBER of moles produced by 1 MOLE of ionic compound
`DeltaT_(F)=iK_(f)m, i=DeltaT_(f)//K_(f)m`
`DeltaT_(f)=0-(-0.00732)`
`=0.00732^(@)C`
`K_(f)=1.86^(@)C//m`
`m=0.0020`
`i=(0.00732)/(1.86xx0.0020)`
`=1.96~~2`


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