Question

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求問這題的c小題

4. A solid mixture of Na2SO4 and K2SO4. A 0.205 g of
sample of the mixture is dissolved in water. A excess of
an aqueous solution of BaC12 is added. The BaSO4 is
formed is 0.289 g. a. What mass of SO4-2 ion is in the
sample? b. What is the mass percent of SO4-2 ion in the
sample? c. What are the percent compositions by mass of
Na2SO4 and K2SO4 the sample?
a. 0.123 g of SO4-2 ion
b. 60% of SO4-2 ion
c. the mixture is 61% K2SO4 and 39% Na2SO4

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