Question

Balance the following equations 1.Mg + O2 --- Ngo 2. Fe + HCl - FeCl2 + H2 3. Zn + H2SO4 - ZnSO4 + H2 4. N2 + H2 -- NH3 5. NaCl + AgNO3 -- AgCl + NaNO3

Answer 1

Balancing the following equation :

1) $\sf{Mg + O_2 \rightarrow MgO}$

$\implies\sf{2Mg + O_2 \rightarrow 2MgO}$

2) $\sf{Fe + HCl \rightarrow FeCl_2 + H_2}$

$\implies\sf{Fe + 2HCl \rightarrow FeCl_2 + H_2}$

3) $\sf{Zn+ H_2SO_4 \rightarrow ZnSO_4 + H_2}$

$\implies\sf{Zn+H_2SO_4 \rightarrow ZnSO_4 + H_2}$ (Already Balanced)

4) $\sf{N_2 + H_2 \rightarrow NH_3}$

$\implies\sf{N_2 + 3H_2 \rightarrow 2NH_3}$ (Also called Haber's process)

5) $\sf{NaCl + AgNO_3 \rightarrow AgCl + NaNO_3}$

$\implies\sf{NaCl + AgNO_3 \rightarrow AgCl + NaNO_3}$ (already balanced)

Chemical equation : A equation used to depict the chemical reaction in which certain elements and compounds undergo is called a chemical equation .

Balanced Chemical equation : A chemical equation in which number of atoms of all elements remain equal on both sides is called a balanced chemical equation .

We can change the simple chemical equations by hit and trial method . In this method , we choose numbers by hit and trial that fit our chemical equation well . In this method, it should be mind that Oxygen and Hydrogen should always be balanced at last , for convenience .

An ionic equation can be balanced by ion - exchange method by knowing the compounds undergone redox reaction.