Question

6 × 10^-3 g oxygen is dissolved per kg of sea water. Calculate the ppm of

oxygen in sea water.​

Answer 1

6×10⁻³ Oxygen per 1 kg(1000g) of sea water.

ppm = (mass of solute)×10⁶/(mass of solution)

= (6×10⁻³×10⁶)/10³= 6 ppm

Answer 2

The concentration of oxygen in sea water is 6 ppm

Explanation:

ppm is the amount of solute (in milligrams) present in kilogram of a solvent. It is also known as parts-per million.

To calculate the ppm of oxygen in sea water, we use the equation:

$\text{ppm}=\frac{\text{Mass of solute}}{\text{Mass of solution}}\times 10^6$

Both the masses are in grams.

We are given:

Mass of oxygen = $6\times 10^{-3}g$

Mass of solution (sea water) = 1 kg = 1000 g   (Conversion factor:  1 kg = 1000 g)

Putting values in above equation, we get:

$\text{ppm of oxygen in sea water}=\frac{6\times 10^{-3}}{1000}\times 10^6\\\\\text{ppm of oxygen in sea water}=6$

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