Question

how many moles of kcl would be dissolved in 4 l of water to make a 2 m solution?
a. 4 moles
b. 2 moles
c. 8 moles
d. $\frac{1}{2}$ mole

Explanation:

Step1: Recall molarity formula

Molarity ($M$) = $\frac{\text{moles of solute}(n)}{\text{volume of solution}(V)}$ in liters.

Step2: Rearrange formula for moles

$n = M\times V$.

Step3: Substitute given values

Given $M = 2\ M$ and $V = 4\ L$. So $n=2\ mol/L\times4\ L$.

Step4: Calculate moles

$n = 8\ mol$.

Answer:

C. 8 moles