A litre of sea water weighing 1030 g contains about 6 x 10^-3 g of dissolved oxygen. The concentration of dissolved oxygen expressed in parts per million (ppm) by mass is approximately:
A5.8 ppm
B0.58 ppm
C58 ppm
D1.03 ppm
Answer & Solution
Correct answer: A. 5.8 ppm
1. ppm (mass) = (mass of component / total mass) $\times 10^6$.
2. = $(6 \times 10^{-3} / 1030) \times 10^6$.
3. = $(5.83 \times 10^{-6}) \times 10^6$.
4. $\approx 5.8$ ppm.
_Source: NCERT Class 12 Chemistry Ch 1 "Solutions", p.2_
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