A certain substance X melts at a temperature of −9.9°C . But if a 350g sample of X is prepared with 31.8g of urea NH22CO dissolved in it, the sample is found to have a melting point of −13.2°C instead.
a. Calculate the molal freezing point depression constant Kf of X . Round your answer to 2 significant digits.

the molal freezing point depression constant Kf of X  = 2.18 degree celsius

Explanation:

The step by step calculation using the relationship between the depression of freezing point and the molal concentration is as shown in the attachment.

- aluminum and copper chloride.

- the chloride ion to separate the aluminum from the oxygen so that the aluminum can react with the copper ions (and the water molecules).

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