Question

Balance the following equations

Mg+H2O ------>Mg(OH)2+H2​

Answer 1

Answer:

Mg + 2H2O -> Mg(OH)2 + H2 is the balanced rcn

Answer 2

Basis

The number of atoms stays after the chemical reaction.

Rewrite the chemical equation to balance it.

$\mathrm{ a Mg + bH_2 O \Longrightarrow cMg (OH)_2 + dH_2 }$

Find the number of each atom.

Before the reaction:

• H: 2b
• O: b
• Mg: a

After the reaction:

• H: 2c+2d
• O: 2c
• Mg: c

Equating the number of atoms:

$\begin{cases} & \text{ [No. of H] } 2b = 2c + 2d\\ & \text{ [No. of O] } b = 2c\\ & \text{ [No. of Mg] } a = c \end{cases}$

$\implies a : b : c : d = 1 : 2 : 1 : 1$

Therefore, the simplest chemical equation is $\mathrm{ Mg + 2H_2 O \Longrightarrow Mg (OH)_2 + H_2 }$.