In [tex]\rm 4\;NH_3[/tex], the 4 has been the coefficient of the compound and represents the number of molecules of ammonia.
[tex]\rm NH_3[/tex] has been a compound of nitrogen and hydrogen. The compound has been a covalent compound, formed by the sharing of electrons in between nitrogen and hydrogen.
The compound has been consisted of 1 nitrogen atom and 3 hydrogen atoms. The hydrogen atoms bonding results in the completion of the octet of the nitrogen and provides stability to the compound.
While writing the chemical equation, the coefficient of the compound has been describing the number of molecules present in the reaction. In [tex]\rm 4\;NH_3[/tex], the 4 has been the coefficient of the compound and represents the number of molecules of ammonia.
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