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t is speculated that arsenic (yes, arsenic!) may be an ultra-trace element in the human body,...

t is speculated that arsenic (yes, arsenic!) may be an ultra-trace element in the human body, meaning we need it to survive. Nutritionists estimate that a 75.0-kg person may have as much as 12 micrograms of As in their body. What is the concentration of As in ppb? Give your answer to two significant figures.

Answer in (ppb As)

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Amount of arsenic(As) = 12 ugx-4 1000 ng - 12000 ng 148 1000 g -75,000 g weight of body = 75.0 kg x 75.0 kg 1 kg Concentratio

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