Question

Write the complete balanced equation of $\mathrm{CuO}+{\mathrm{NH}}_3\to \mathrm{Cu}+{\mathrm{N}}_2+{\mathrm{H}}_2\mathrm{O}$ .

Answer 1

Balanced chemical equation: A balanced chemical equation is the representation of a chemical reaction in which the number of atoms of each element is the same on both the reactant and product sides.

Balancing the Chemical Equation:

Step 1: Write the number of atoms of each element

$\underset{\mathrm{Copper}\left(\mathrm{II}\right)\mathrm{oxide}}{\mathrm{CuO}}+\underset{\mathrm{Ammonia}}{{\mathrm{NH}}_3}\to \underset{\mathrm{Copper}}{\mathrm{Cu}}+\underset{\mathrm{Nitrogen}}{{\mathrm{N}}_2}+\underset{\mathrm{Water}}{{\mathrm{H}}_2\mathrm{O}}$

Element	Reactant side	Product Side
Cu	1	1
O	1	1
N	1	2
H	3	2

• From the table, it is clear that the atoms of Nitrogen and hydrogen are not balanced.

Step 2: Balancing the unbalanced atoms

• For balancing the Nitrogen atoms we will make the coefficient of ${\mathrm{NH}}_3$ as $2$
• Now the equation becomes

$\underset{\mathrm{Copper}\left(\mathrm{II}\right)\mathrm{oxide}}{\mathrm{CuO}}+\underset{\mathrm{Ammonia}}{2{\mathrm{NH}}_3}\to \underset{\mathrm{Copper}}{\mathrm{Cu}}+\underset{\mathrm{Nitrogen}}{{\mathrm{N}}_2}+\underset{\mathrm{Water}}{{\mathrm{H}}_2\mathrm{O}}$

Element	Reactant side	Product Side
Cu	1	1
O	1	1
N	2	2
H	6	2

Now for balancing the rest of the atoms we will make the coefficient of $\mathrm{CuO},\mathrm{Cu}\mathrm{and}{\mathrm{H}}_2\mathrm{O}$ as $3$.

The equation becomes,
$\underset{\mathrm{Copper}\left(\mathrm{II}\right)\mathrm{oxide}}{3\mathrm{CuO}}+\underset{\mathrm{Ammonia}}{2{\mathrm{NH}}_3}\to \underset{\mathrm{Copper}}{3\mathrm{Cu}}+\underset{\mathrm{Nitrogen}}{{\mathrm{N}}_2}+3\underset{\mathrm{Water}}{{\mathrm{H}}_2\mathrm{O}}$

Element	Reactant side	Product Side
Cu	3	3
O	3	3
N	2	2
H	6	6

Hence, the balanced chemical equation is $\underset{\mathrm{Copper}\left(\mathrm{II}\right)\mathrm{oxide}}{3\mathrm{CuO}}+\underset{\mathrm{Ammonia}}{2{\mathrm{NH}}_3}\to \underset{\mathrm{Copper}}{3\mathrm{Cu}}+\underset{\mathrm{Nitrogen}}{{\mathrm{N}}_2}+3\underset{\mathrm{Water}}{{\mathrm{H}}_2\mathrm{O}}$