10.30 mg of $\mathrm{O}_{2}$ is dissolved into a liter of sea water of density $1.03 \mathrm{~g} / \mathrm{mL}$. The concentration of $\mathrm{O}_{2}$ in ppm is ____.

JEE Main · 2020 · 09 Jan 2020 · Shift 2 · Some Basic Concepts of Chemistry

10.30 mg of

O_{2}

is dissolved into a liter of sea water of density

1.03 g / mL

. The concentration of

O_{2}

in ppm is ____.

Answer: 10

Solution

Here parts per million is the mass of oxygen per unit mass of solution, expressed as milligrams of solute per kilogram of solution. One litre of sea water of density

1.03 g/mL

has a mass of

1000 \times 1.03 = 1030 g = 1.03 kg

. With

10.30 mg

O_{2}

dissolved, the concentration is

\frac{10.30 mg}{1.03 kg} = 10 ppm

JEE Main · 2020 · 09 Jan 2020 · Shift 2 · Integer answer

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