Rust is a compound that is 70.7% iron, and 29.3% oxygen. How many grams of iron, and how many grams of oxygen are there in 680.0 grams of rust?

To find the mass of each component, we multiply the total mass of 680 g by the percentage composition of each component.

If rust is 70.7% iron, then 680.0 g rust * 70.7% = 480.76 g iron.

For the 29.3% oxygen, multiplying 680.0 g rust * 29.3% = 199.24 g oxygen.