It is found that elevation in boiling point of a given aq. NaCl solution is equal to depression in freezing point of 0.25 molal aq. Na2CO3 solution. If Kf=1.86∘C mol−1kg and Kb=0.52∘C mol−1kg, then molality of NaCl solution, assume complete ionisation of NaCl & Na2CO3 in aqueous solutions. Give your answer in nearest integer. (Assume no hydrolysis)__________

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It is found that elevation in boiling point of a given aq. $N a C l$ solution is equal to depression in freezing point of 0.25 molal aq. $N a_{2} C O_{3}$ solution. If $K_{f} = {1.86}^{\circ} C m o l^{- 1} k g a n d K_{b} = {0.52}^{\circ} C m o l^{- 1} k g$ , then molality of $N a C l$ solution, assume complete ionisation of $N a C l$ & $N a_{2} C O_{3}$ in aqueous solutions. Give your answer in nearest integer. (Assume no hydrolysis)__________

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$Δ T_{f_{}} = i k_{f} m & Δ T_{b} = i k_{b} m$

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