June 2023 NY Regents Chemistry Exam

42 How many moles of KI are needed to make 0.50 L of a 0.20 M aqueous solution? (1) 0.10 mol

(2) 0.25 mol

(3) 0.40 mol

(4) 0.70 mol

Solution: Table T has the equation for molarity where molarity = moles of solute/ liters of solution. Let's plug what is given into the equation. 0.20M = x/0.50L

Answer: 1

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the "answer" isnt even an answer choice