12. a. What is the molarity of a solution made by mixing 125 mL of 5.00 M H3PO4 with 325 mL H2O? b. What is the molarity of a solution make by mixing 75 mL of 0.25 M Na2SO4 with 150 mL H2O? c. What volume of 9.00 M HNO3 is needed to make 675 mL of 0.750 M HNO3?

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