1. Percent is really a ratio that can be used as a conversion factor.
Using Percent as a Conversion Factor
Percent is really a ratio that can be used as a conversion factor.

2. Let’s create a ratio to use as a conversion factor.
A sample of ore was found to contain 0.35 % Au by mass. How many milligrams (mg) of Au can be recovered from 535 kg of ore?
535 kg ore
1 x 103
0.35 Au m
= mg Au
1.87 x 106
100 ore k
1 x 10-3
Let’s create a ratio to use as a conversion factor.
0.35 Au
100 ore