How many moles of potassium hydroxide, KOH are needed to prepare 2L of a 2M solution? A. 1 mole B. 2 moles C. 3 moles D. 4 moles A B C D

## Step 1<br />The problem involves the concept of molarity in chemistry. Molarity (M) is defined as the number of moles of solute divided by the volume of the solution in liters. The formula for molarity is:<br />### \(M = \frac{moles\,of\,solute}{volume\,of\,solution\,in\,liters}\)<br /><br />## Step 2<br />In this problem, we are given the molarity (M) as 2M and the volume of the solution as 2L. We are asked to find the number of moles of potassium hydroxide (KOH).<br /><br />## Step 3<br />We can rearrange the molarity formula to solve for the number of moles:<br />### \(moles\,of\,solute = M \times volume\,of\,solution\,in\,liters\)<br /><br />## Step 4<br />Substitute the given values into the formula:<br />### \(moles\,of\,KOH = 2M \times 2L = 4 moles\)