Hi my sincere apologies, question 10 requires important Kf (molal freezing point constant) values, which was not provided by you, hence I'm gonna answer 1st question only to save your Attempts.
moles = mass of substance / molar mass of substance
moles present in 0.892 g of MgCl2 = 0.892 g / 95.2110 g/mol = 0.00936866538 moles
but 1 mole MgCl2 gives 2 moles Cl-, hence doubles the Cl- ions
2 x 0.00936866538 moles = 0.01873733076 moles
Answer: 0.0187
Hope this helped you!
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