Calculate Selenium Conc. in Phoenix Tap Water (mg/L)

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The discussion revolves around calculating the concentration of selenium in Phoenix tap water, given the phosphate concentration of 7.3 ppm. Participants express confusion, noting that the question lacks necessary information to determine selenium levels. One contributor suggests it may be a typo, indicating the professor likely meant to ask for phosphate concentration in mg/L instead. There is a consensus that without additional data or context, the problem cannot be solved as presented. The conversation highlights the importance of clarity in homework questions.
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Homework Statement


Suppose the concentration of phosphate in Phoenix tap water is 7.3 ppm (mass based), then what is the concentration of selenium in milligrams per liter? The density of water is 1 g/mL.

Homework Equations



Phosphate: PO4-3; 7.3 parts/million

The Attempt at a Solution


I honestly have no idea how to start. They want concentration of selenium but there is no mention of it from the information stem. Maybe it's just a typo and they mean concentration of phosphate in mg/L. Anyways, please guide me in the right direction. Thanks!
 
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There is some piece of information missing, no way this can be solved as worded.

Well, there is a slight chance that there was some additional information buried in the text outside of the question, stating that ratio of both in typical drinking water is almost constant or something like that. But I don't think that's the case.

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Yeah... it was a typo by the professor. Haha. Thanks anyways though!
 
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