Chemistry homework help? need urgent!

Posted on 2016-04-11 18:46:00 in Chemistry by THOMAS

In clinical applications, the unit ppm is used to express very small concentrations of solute, where 1 ppm is equivalent to 1 mh of solute per 1 L of solution. Calculate the concentration in ppm for each of the following solutions. 
There are 37 ug calcium in a total volume of 81 mL 
___ppm 

There is 0.97 mg caffeine in a total volume of 119 mL 
___ppm 

There is 0.81 mg trace particle in a total volume of 91 dL solution 
____ ppm

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