# 4 mg of zinc found in 100g of oysters what is the ppm?

##### 1 Answer

Sep 3, 2015

#### Explanation:

Very small concentrations are usually expressed in parts per million, which denote **one part solute** per **one million parts solution**.

In other words, if you take the ratio between the mass of the solute and the mass of the solution, both expressed in **grams**, and multiply it by

This is exactly how you would get *percent concentration*, the only difference beingthat you need to multiply that ratio by

So, your concentration in ppm is

#(4 * 10^(-3)color(red)(cancel(color(black)("g"))))/(1 * 10^2color(red)(cancel(color(black)("g")))) * 10^6 = 4 * 10^1 = color(green)("40 ppm")#