What effect would adding water (h2o) have on this reaction over time? (nh4)2co3(s) ⇌ 2nh3(g) +co2(g) +h2o(g)

Answer is: the position of equilibrium will move to the left.

Balanced chemical reaction: (NH₄)₂CO₃ ⇄ 2NH₃ + CO₂ + H₂O.

According to Le Chatelier's Principle the position of equilibrium moves to counteract the change.

The position of equilibrium will move so that the concentration of water decreases again by reacting it with ammonia and carbon dioxide.

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

            and  

since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.