Question

When iron metal reacts with sulfuric acid, it produces iron (III) sulfate and hydrogen gas. Balance the equation: Fe + H2SO4 → Fe2(SO4)3 + H2.
Explain why it is necessary to balance chemical equations and why coefficients can be added to an equation, but subscripts cannot be changed

Answer 1

Answer:

2Fe(s) + 3H₂SO₄ → Fe₂(SO₄)₃ + 3H₂(g)

Explanation:

The equation for the reaction between iron metal and sulfuric acid is given by;

Fe(s) + H₂SO₄ → Fe₂(SO₄)₃ + H₂(g)

We are supposed to balance the equation:

What do we mean by balancing a chemical equation?

• Balancing a chemical equations means that we want to make sure the number of atoms of each element is the same on both sides of the equation.

How is balancing done?

• Balancing of chemical equations is try and error process that is done by putting appropriate coefficients on the reactants and products to equate the number of atoms of each element.

Why are subscripts on the compounds not changed?

• Subscripts in a compound show the actual number of atoms of each element in the compound and therefore can never be altered with because it will distort the chemical compound.

Why is it necessary to balance chemical equations?

• Chemical equations are balanced for them to obey the law of conservation of mass.
• According to this law, the mass of the reactants should be equal to the mass of products, which is achieved through balancing an equation.

What is the required balanced equation?

• The equation given can be balanced by putting the coefficients 2, 3, 1, 3 in that order on the reactants and products.

• Therefore, the balanced chemical equation is;

2Fe(s) + 3H₂SO₄ → Fe₂(SO₄)₃ + 3H₂(g)

Answer 2

The equation :  2Fe + 3H₂SO₄ → Fe₂(SO₄)₃ + 3H₂

Further explanation

Equalization of chemical reaction equations can be done using variables. Steps in equalizing the reaction equation:

• 1. gives a coefficient on substances involved in the equation of reaction such as a, b, or c etc.

• 2. make an equation based on the similarity of the number of atoms where the number of atoms = coefficient × index between reactant and product

• 3. Select the coefficient of the substance with the most complex chemical formula equal to 1

For gas combustion reaction which is a reaction of hydrocarbons with oxygen produces CO₂ and H₂O (water vapor). can use steps:

Balancing C atoms, H and the last O atoms

We give variable :

aFe + bH₂SO₄ → 1Fe₂(SO₄)₃ + cH₂

Atoms Fe : left a , right 2 ---> a = 2  ...1

Atoms H : left 2b, right 2c ---> 2b=2c ...2

Atoms S : left b, right 3 --> b =3 ...3

from (2) :

2b=2c

2.3 = 2c

c = 3

Atoms O : left 4b, right 12 ---> 4b = 12 ---> b = 3 (proven)

The equation become :

2Fe + 3H₂SO₄ → Fe₂(SO₄)₃ + 3H₂

it is necessary to balance chemical equations to show the law of conservation of a matter and to know the amount of a substance involved in a reaction. Useful for carrying out calculations involving products and reactants

Subscript can not be change because it is the mole ratio of the elements to form compund which are fixed

Learn more

The law of conservation of matter

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Keywords : coefficients, chemical equation

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