Question

Read the following chemical equation.

Fe + O2 → Fe2O3

Which of the following fractions can be used for the mole ratio to determine the mass of Fe from a known mass of Fe2O3? (4 points)
A 4/2
B 3/2
C 2/3
D 2/4

Answer 1

Answer:

4/2 is correct. I did test

Explanation:

Answer 2

Given: The given reaction is $Fe+O_2\rightarrow Fe_2O_3$.

To find: We have to find the mole ratio.

Solution:

The given reaction is $Fe+O_2\rightarrow Fe_2O_3$.

The balanced reaction is as follows-

$4Fe+3O_2\rightarrow 2Fe_2O_3$

In this reaction, four moles of Fe reacts with three moles of oxygen to form two moles of ferric oxide.

Thus, the mole ratio of Fe and ferric oxide is 4/2.

Thus, the mole ratio to determine the mass of Fe from a known mass of ferric oxide is 4/2.

The correct option is A.