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Answer the following questions:
   
Answer variants:
law of conservation of mass
(↑)- shows evolution of water, (↓)-represents a byproduct.
\(CO\)(g) + \(2N_2\)(g) \(\xrightarrow[]{340 atm}\) \(CH_3NH\)(l)
\(AgNO_3\)(aq) + \(NaCl\)(aq) → \(AgCl\)(s) + \(NaNO_3\)(aq)
   
1. Write a balanced equation for the chemical reaction that can be characterised as precipitation reaction.
   
 
2. On what basis is a chemical reaction balanced?