Question

A 0.0140g sample of an ionic compound with the formula Cr(NH)sCl, was dissolved in water to give 25.0mL of solution at 25°C. The osmotic pressure was determined to be 119mmHg. How many ions must be obtained from each formula unit when this compound is dissolved in water? rin o r Om 1112

Answer 1

Sha) concentration of Co (NH3){dz = males Volume mass malay massx Velene = 0.0149 81000 - 2.29810 M 243.51/mol X25 L ' T= 25+273 = 298 K. P=119 mm Hg x latma 119 atm. 760 mm Hq 760 Muswad Solutian hee know that, r=iCRT where Ra 0.0821 atma 119 = x2:29 x16 30.0821 X298 molk. 760 119 760 X 2. 29 X10*3X0.0821X298 i = 2.78 8 = no. of ions oftere dissociation Enitial no of ious. 7 = nos of forms ofter dissociation Shy 4o. 3 ions must be obtained from each formula unit when this compound is dissociested in waterre.

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