Question

3Fe + 4H2O Fe3O4 + 4H2

Answer 1

Explanation:

$3Fe + 4H_2O\rightarrow Fe_3O_4 + 4H_2$

According to reaction, 3 atoms of iron reacts with 4 molecules of water to give 1 molecule of ferric oxide and 4 molecules of hydrogen gas.

Number of molecules of hydrogen gas =Stoichiometric coefficient of$H_2$

= 4 molecules

4 molecules of hydrogen gas are produced.

According to reaction, 4 molecules of water reacts with 3 atoms of iron.

And in 1 molecule of water there are 2 oxygen atoms.

Then 4 molecules of water have = 4 × 2 = 8 atoms of oxygen

4 oxygen atoms are required.

the given reaction can also be read as,According to reaction, 3 moles of iron reacts with 4 moles of water to give 1 mole of ferric oxide and 4 moles of hydrogen gas.

1 moles of $Fe_3O_4$ are formed.

Moles of $Fe_3O_4$ = 1

Moles of $H_2O$ = 4

Mole ratio of Fe to $H_2O$ = $\frac{1}{4}$

Mole ratio of Fe to $H_2O$ is 1:4.

According to reaction, 4 molecules of water reacts with 3 atoms of iron.

And in 1 molecule of water there are 1 hydrogen atoms.

Then 4 molecules of water have = 4 × 1 = 4 atoms of hydrogen.

4 hydrogen atoms are involved in this reaction

Answer 2

These are five questions with its five answers.


First, we have to explain main question.


The statement provides the chemical equation for the reaction of Fe with water to produce iron(III) oxide and hydrogen.


Fe3O4 is a weird chemical formula. It belongs to the product named oxoiron.


Next, I have to tell how you must interpret the question. The five questions are based on the complete reaction of the same number of moles as the coefficients indicated in the chemical equation.


Those coefficients are 3 for Fe, 4 for H₂O, 1 for Fe₃O₄ and 4 for H₂.


With that understood, let's work every question.


1) How many molecules of H₂ are produced?


Answer: 4 moles of molecules.

Justification:


This is, the number of moles of H₂ produced is given by the coefficient indicated in the chemical equation.


2) How many oxygen atoms are required?


Answer: 4.

This is, the atoms of oxygen are supplied in the molecules of water. Since the coeffcient of water is 4, and each molecule o fwater has 1 atom of oxygen, 4 moles of water contain 4 moles of atoms of oxygen.


3) How many moles of Fe₃O₄ are formed?


Answer: 1.


Justification: the coefficient of for formula Fe₃O₄ is 1, indicating that the theoretical yield is 1 mol of molecules.


4) What is the mole ratio of Fe to H₂O?


Answer: 3:4


Justification:


The ratio is the quotient of the two coefficients: the coefficient of the Fe divided by the coefficient of the H₂O.


5) How many hydrogen atoms are involved in this reaction?


Answer: 8 moles of hydrogen atoms.


Justification: as you can see each molecule of H₂O has 2 atoms of hydrogen, then 4 moles of molecules of H₂O have 8 moles of atoms of hydrogen. And of course the same number are in the produt: 4 moles of H₂ contain 8 moles of atomos of hydrogen