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A water sample contains 0.0500 grams of arsenic in 10.0 liters...?

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what is the As concentration in parts per million (ppm)?

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10 liters weights10^4 grams.   So,in ppm weight,

the conc is 0.05/10^4 =  5x10^-6 grams As/g H2O, or 5 ppm.
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