# chemistry

Can some one please balance this equation for me
Fe + O2---> Fe2O3.

Fe + O2 ==> Fe2O3.
Here is the way to balance these equations by inspection, meaning, by trial and error.
Rule #1. You may not change any subscripts. Equations are balanced by changing ONLY the coefficients.
Look on the right side and I see 2 Fe atoms. So we move to the left and place a 2 in front of the Fe.
2Fe + O2 ==> Fe2O3

Now look at the 3 O on the right. That is what we must have on the left. Two ways to approach this. I can balance it by placing 3/2 in front of the O2 like this.
2Fe + 3/2 O2 ==> Fe2O3. And the equation balances. Let's check it.
We have 2 Fe atoms on the left and right.
We have 3 O (3/2 * 2 = 3) atoms on the left and right.
Most of us like to see equations in whole numbers, not fractions, so we now multiply the entire equation by 2 to get rid of the 1/2.
4Fe + 3O2 ==> 2Fe2O3.

The second way: Starting with
2Fe + O2 ==> Fe2O3.

Look at O on the right and there are 3 atoms with two O atoms on the left. We know a whole numbrer coefficient won't work, so we trial and error. Knowing that 6 is a multiple of both 2 and 3, we just multiply Fe2O3 by 2 in order to have 6 O atoms on the right. And on the left we have a coefficient of 3 for O2.
2Fe + 3O2 ==> 2Fe2O3.
That gives us 6 O on the left and 6 on the right. Of course, it messed up the Fe but we can fix that easily. Since we now have 4 Fe on the right, we change the 2 for 2Fe on the left to 4Fe and the final equation is
4Fe + 3O2 ==> 2Fe2O3.

If your algebra is up to speed the balancing can also be done this way:

Fe + xO2 ==> yFe2O3

balancing Fe atoms
1=2y------------------(1

balancing O atoms
2x=3y------------------(2

for from equation (1
y=1/2

and substituting this in equation (2

2x=3(1/2)

so x=3/4

Replacing the symbols in the original

Fe + 3/4O2 ==> 1/2Fe2O3

but we are not allowed fractions so multiply through by 4

4Fe + 3O2 ==> 2Fe2O3

1. 👍 0
2. 👎 0
3. 👁 902
1. Ag+
N2==>Ag3N

1. 👍 0
2. 👎 0

## Similar Questions

1. ### Chemistry

Can you balance this equation please? Fe2O3 + CO yeilds Fe + CO2 Fe2O3 + CO ==> Fe + CO2 Rule: balance by changing coefficients. You may not change subscripts. Look at the Fe atoms. There are 2 Fe atoms on the left and only 1 on

asked by mZ. YoU on February 20, 2007
2. ### College Chemistry

A 1.00g of sample of an iron ore containing Fe2O3 was dissolved in an acid and all the iron converted to Fe^2+. The solution was to rated with 90.40 cm^3 of 0.2M to give Me ^3+ and MnO4^- among the products. a) Balance equation

asked by Mayunda on August 13, 2019
3. ### Chemistry

For the following reaction: Fe2O3 + 3CO --> 2Fe + 3CO2 how many grams of Fe2O3 is needed to produce 111 g of Fe? A) 79.3 g Fe2O3 B) 159 g Fe2O3 C) 317 g Fe2O3 D) 71.4 g Fe2O3

asked by Petey on April 9, 2016
4. ### Science

How do you balance this equation? Fe2O3+C=Fe+CO2

asked by Emily on February 28, 2013
5. ### Chemistry

How do I do these? 1. Balance the equation for the reaction between zinc and hydrochloric acid. Zn + HCl ZnCl2 + H2 2. Balance the equation for the reaction between iron (steel wool) and oxygen (water). Fe + O2 Fe2O3 3. Balance

asked by IWouldAlwaysOpenUpTheDoor on December 23, 2017
6. ### Honors Chemistry

Equation: Fe2O3 + 2Al ---> 2Fe + Al2O3. How many grams of Fe2O3 react with excess Al to make 475g Fe? Can you show me step by step how to do it? My book says the answer is 679g Fe2O3.

asked by Anan on February 23, 2010
7. ### Physical Science/ Chemistry

I don't get how to balance this equation. Al+O2 → Fe2O3 Where is the Al in the product? Where is the Fe in the reactants? I am very lost with this problem.

asked by Alyonka on January 20, 2012
8. ### Chemistry

4Fe + 3O2 -> 2Fe2O3 + 1.65E3 kJ  C) what is the enthalpy change for the formation of 23.6 g of iron(iii) oxide?  I'm trying to understand thermochemical reactions and stoichiometry, so could you please tell me if this is