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32 g of hydrated magnesium sulphate MgSO ₄ xH ₂ O , when dissolved in 84 g of water, the solution freezes at -4.836 ^ C . If K _ f =1.86 ~K ~kg ~mol ⁻¹ and MgSO ₄ is a strong electrolyte, what is the value of x ?

Correct answer

7

Step-by-step solution

molar mass of salt =120+18 x mass of water present in the salt = 18 x 120+18 x 32 ~g Molality of the solution = 32 120+18 x [ 1000 84+ 18 32 x 120+18 x ]= 4000 1260+261 x gathered T_f=4.836=2 1.86 4000 1260+261 x x=6.9 7 gathered

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