Question

how many moles are needed to make 2.50 l of a 3.8 m potassium bromide solution? -use correct significant digits and no unit-

Explanation:

Step1: Recall molarity formula

Molarity $M = \frac{\text{moles of solute }n}{\text{volume of solution }V}$

Step2: Rearrange to solve for moles

$n = M \times V$

Step3: Substitute given values

$n = 3.8 \times 2.50$

Step4: Calculate and apply sig figs

$n = 9.5$

Answer:

9.5