Answer :
The 3 in the 3NH4 denotes the 3 molecules of NH3 are there to balance the equation and 4 in the 3NH4 denotes that 4 molecules of hydrogen are bonded with one nitrogen atom.
Ammonium cation is a positively charged polyatomic ion with the formula NH4+ which is formed by protonation of ammonia NH3.
The lone pair of N forms bond with the H+ proton hence all the four bonds formed are polar covalent bond. It forms a tetrahedral structure.
The ammonium ion is mildly acidic in nature with conjugated base as Ammonia.
It is produced as a waste product by the metabolism of animals which is excreted out by our excretion system.
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