) According to the reaction : Na2SO4(aq) + BaCl2(aq)
2NaCl(aq) + BaSO4
What is the molarity of Na2SO4 solution when 250 mL of it are required to
precipitate 5.28 g of barium sulphate ?
Please answer

Question 3(multiple choice worth 4 points) (04.04 lc) what does it mean when an element is reduced? it empties a valance shell, reducing its atomic radius. it gains electrons, reducing its overall charge. it increases electronegativity, reducing its ability to bond. it loses electrons, reducing its electron number.