Q1.76CP - Chemistry: Molecular Nature Of Matter And Change

Question

Bromine is used to prepare the pesticide methyl bromide and flame retardants for plastic electronic housings. It is recovered from seawater, underground brines, and the Dead sea. The average concentrations of bromine in seawater (d=1.024 g/mL) and the Dead Sea (d=1.22 g/mL) are 0.065g/L and 0.50 g/L, respectively. What is the mass ratio of bromine in the Dead Sea to that in seawater?            

Step-by-Step Solution

Answer

The answer is, 0.13:1

Step 1: The mass ratio

The mass ratio can be calculated from the given concentration of bromine in seawater and the Dead Sea. The concentration is the mass in the liter of the solution.

Step 2: Explanation

The average concentration of bromine in seawater and the Dead Sea is 0.065g/L and 0.50g/L.

Then the mass ratio can be calculated as shown below.

  $\frac{0.065}{0.50}=\frac{0.13}{1}$

Hence the mass ratio is 0.13:1.