Question

How many moles of potassium bromide are in 68.5 mL of a 1.65 M solution?Answer is 0.11

Answer 1

Answer:

Number of moles = 0.116 mol

Explanation:

Given data:

Number of moles of potassium bromide = ?

Volume of solution = 68.5 mL

Molarity of solution = 1.65 M

Solution:

First of all we will convert the mL into L.

68.5 mL × 1 L /1000 mL

0.07 L

Molarity = Number of moles / Volume in litter

we will rearrange the formula:

Number of moles = molarity × volume in litter

Now we will put the values in formula:

Number of moles = 1.65 M  ×0.07 L

Number of moles = 0.116 mol