chemistry

You are asked to prepare 0.5 L of a potassium chloride (KCl, molar mass = 74.551 g/mol) solution with a concentration of 0.25 molL-1 . a) How many grams of potassium chloride do you need to prepare this solution? Express your answer to the nearest whole number and show all your calculations. (8 marks) b) What quantity (in mL) of the potassium chloride solution that you prepared in (a) do you need to prepare 0.3 L of a new solution with a concentration of 0.004 mol L-1? Show all your calculations for your answer. (5 marks)