To determine the number of moles of KOH in 250 mL of 2.0 M KOH, follow these steps:
1. Convert the volume from milliliters to liters:
Since molarity (M) is defined as moles per liter (mol/L), we need to convert the volume of KOH solution from milliliters to liters.
[tex]\[
250 \, \text{mL} = 0.250 \, \text{L}
\][/tex]
2. Use the molarity formula:
Molarity (M) is defined as the number of moles of solute per liter of solution. The formula is:
[tex]\[
\text{Molarity} = \frac{\text{moles of solute}}{\text{volume of solution in liters}}
\][/tex]
Rearranging this formula to solve for the moles of solute gives us:
[tex]\[
\text{moles of solute} = \text{Molarity} \times \text{volume of solution in liters}
\][/tex]
3. Substitute the given values into the formula:
[tex]\[
\text{moles of KOH} = 2.0 \, \text{M} \times 0.250 \, \text{L}
\][/tex]
4. Calculate the moles of KOH:
[tex]\[
\text{moles of KOH} = 2.0 \times 0.250 = 0.5
\][/tex]
Therefore, there are 0.5 moles of KOH present in 250 mL of 2.0 M KOH solution.
