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22 November, 03:49

Fish need at least 4 ppm dissolved o2 for survival. part a what is this concentration in mol/l?

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  1. 22 November, 07:29
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    Answer: 3.125x 10^-5 mol/L

    In this case, you are given a unit "ppm" or "part per million". Then 4 ppm means 4 part of oxygen for 1 million part of water. Assuming water density is 1000gram/L and we have 1 L solution, then the water weight should be 1000gram. From 1000gram, the amount of oxygen should be 1000gram x 10^-6 = 1/1000gram.

    After knowing the oxygen mass, convert it into moles. Since oxygen molecular mass is 16, O2 should be 32. The calculation would be: 1/1000gram / (32 gram/mole) = 1/32000mole = 3.125 x 10^-5 mole

    The solution is 1L, then oxygen concentration is 3.125x 10^-5 mol/L
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