Question

How many moles of KBr are dissolved in 50.2 mL of a 1.50 M solution?

Answer 1

There are 0.0753 moles of KBr.

Step-by-step explanation:

The molarity of the solution tells us that there are 1.50 moles of KBr in 1000mL of solution.

But we only have 50.2mL of solution, so with a mathematical rule of three we can calculate the amount of moles in 50.2mL:

`\begin{gathered} 1000mL-1.50moles \\ 50.2mL-x=(50.2mL*1.50moles)/(1000mL) \\ x=0.0753moles \end{gathered}`

So, there are 0.0753 moles of KBr.