The minimum mass of oxygen required in 1kg of water is?

Cold water fish require a minimum of 8 parts per million by mass (ppm) of oxygen dissolved in water. The minimum mass of oxygen required in 1kg of water is A 8 × 10–6 g B 8 × 10–3 g C 8 × 10–2 g D 8 × 10–1 g
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