Please give me explanation for every questions. I really want to know how it is

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Please give me explanation for every questions. I really want to know how it is been solved but not just the answers.

When HNO2 is dissolved in water it partially dissociates according to the equation HNO2 H+ + NO 2- . A solution is prepared that contains 4.000g of HNO> in 1.000 kg of water. Its freezing point is found to be - 0.1692 C. Calculate the fraction of HN02 that has dissociated. Express your answer using two significant figures. A 50.0-mL solution is initially 1.58% MgCL, by mass and has a density of 1.05 g/mL.What is the freezing point of the solution after you add an additional 1,35g MgCL,? (Use i = 2.5 for MgCl2 ) Express your answer using two significant figures.

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