Question

A compound is 69.9% iron and 30.1% oxygen by mass. how much iron could by obtained from 5.41 grams of the compound?

Answer 1

3.78 g

Step-by-step explanation:

The percent composition by mass of the compound is 69.9% iron and 30.1% oxygen. This means that every 100 g of the compound there are 69.9 g of iron and 30.1 g of oxygen. We will use this ratio to find out how much iron could be obtained from 5.41 g of the compound.

5.41 g compound × (69.9 g Fe / 100 g compound) = 3.78 g Fe

Answer 2

the compound is composed of 69.9 % iron and 30.1% oxygen by mass.
Therefore it can be stated that in 100 g of the compound - 69.9 g of the compound is made of iron and 30.1g of compound is made of oxygen.
We are asked to calculate how much mass of iron can be obtained from 5.41 g of compound.
100 g of compound - 69.9 g Fe
In 5.41 g of compound - 69.9 / 100 * 5.41
= 3.78 g of Fe can be obtained