# What is the concentration in parts per million of a 500 g sample of drinking water that contains 45 mg of lead?

##### 1 Answer

Feb 14, 2018

#### Explanation:

PPM can be better understood in typical units of concentration!

PPM can also be represented as mg/L!

Assuming the density of water is 1.0g/ml, we can translate 500.0g of water to be 500.0mL of water!

Therefore,

Turning 500.0mL of water into L first;

For PPM, we want to keep our mass in mg, which was already supplied!

As such,