A solution is made that is 1.2×10−3 M in Zn(NO3)2 and 0.130 M in NH3. After the solution reaches equilibrium, what concentration of Zn2+(aq) remains?

Explanation:

Equation for the reaction can be expressed as:

    ⇄    

From the equation above; we use the ICE table to determine how much complex ion forms  in order to be able to calculate  the at equilibrium.

So;

                                     ⇄    

Initial                                                    

Change                          

Equilibrium                                                    

  ⇒  

=  

=  

=

Therefore, the concentration of Zn2+(aq) after the solution reaches equilibrium =

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.