Question

The combustion of ethanol, C2H5OH(l), in oxygen to form carbon dioxide gas and water vapor is shown by which balanced chemical equation?
A) C2H5OH(l) + O2(g) → CO2(g) + H2O(g)
B) C2H5OH(l) + 3O2(g) → 2CO2(g) + 3H2O(g)
C) 2CO2(g) + 3O2(g) → C2H5OH(l) + 3H2O(g)
D) 2CO2(g) + 3H2O(g) → C2H5OH(l) + 3O2(g)

Answer 1

Answer:

Explanation:

The answer is B.

B) C2H5OH(l) + 3O2(g) → 2CO2(g) + 3H2O(g)

Answer 2

The combustion of ethanol, C2H5OH(l), in oxygen to form carbon dioxide gas and water vapor is shown by this balanced chemical equation: B) $C_2H_5OH_{(l)} + 3O_2_{(g)}$ -----> $2CO_2_{(g)} + 3H_2O_{(g)}$

In Chemistry, a chemical equation is typically used to denote or represent the chemical reaction between two or more chemical elements.

A balanced chemical equation can be defined as a chemical equation wherein the number of atoms on the reactant (left) side is equal to the number of atoms on the product (right) side.

• From the question, we know that the reactants undergoing combustion are ethanol and oxygen while the products are carbon dioxide gas and water vapor.

Ideally, the first step in balancing a chemical equation is to count the number of atoms in the reactant and product side.

                  $C_2H_5OH_{(l)} + 3O_2_{(g)}$ -----> $2CO_2_{(g)} + 3H_2O_{(g)}$

For reactants:

• Carbon = 2 atoms.

• Hydrogen = 6 atoms.

• Oxygen = 1 + 6 = 7 atoms.

For products:

• Carbon = 2 atoms.

• Hydrogen = 6 atoms.

• Oxygen = 4 + 3 = 7 atoms.

Since, the number of atoms on the reactant (left) side is equal to the number of atoms on the product (right) side, it is a balanced chemical reaction (equation).

In conclusion, we can deduce that the above chemical equation is balanced based on the above data.

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