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2.2 A batch of 100g of Na2SO4 is dissolved in 200g of H20 and the solution is
cooled until 100g of Na2SO4:10H2O is crystallized out. Please do a DOF
analysis and calculate the composition of the remaining solution.
(Na2SO4:10 H2O = 322.2, Na2SO4=142.05)
Answer: DOF = 0; Na2SO4 28%, H20 72%