How many grams of bromine are there


Seawater contains 0.0065% (by mass) of bromine. How many grams of bromine are there in 2.50 L of seawater? The density of seawater is 1.025 g/cm^3

Solution:

Let us first find the mass of the seawater.

m_{seawater}=2.50L\times \frac{10^3\text{cm}^3}{1L}\times \frac{1.025g}{1\text{cm}^3}=2.5625\times 10^3\,g

Now, we can find the mass percentage of bromine.

Mass percentage = \frac{\text{mass of Br in seawater}}{\text{mass of seawater}}\times 100\%

Isolating for mass of bromine gives us:

Mass Br =\frac{0.0065\%}{100\%}\times 2.5625\times 10^3\,g

Mass Br=0.166 g

This question can be found in General Chemistry, 9th edition, chapter 3, question 3.54

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