I don't have any multiple choice options, so I have to solve it from scratch. I can't do so because I don't even know where to start. Any help would be greatly appreciated. Thank you.
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molarity = moles / volume in liters
0.40 mol/L = x / 0.650 L
x = 0.26 mol
0.40 mol/L = x / 0.650 L
x = 0.26 mol