Questlon 5 of 25 Which is an example of using a mathematical model to describe the atom? O A. Finding an equation to calculate the number of neutrons in each element
B. Drawing a picture of an atom as accurately as possible
C. Imagining the atom as small rocks circling around a boulder
D. Building a model that uses pennies as electrons and nickels as protons SUBMIT​

Answer is: the equilibrium  shifts toward the reactants, to the left side of chemical reaction.it is because lead(ii) nitrate dissociates in water: pb(no₃)₂ → pb²⁺(aq) + 2no₃⁻(aq).according to lechatelier's principle, the position of equilibrium moves to counteract thechange (more lead cations, common ion), the position of equilibrium will move so that the concentration ofproducts decrease and concentration of reactants of chemical reaction increase.read more on -

The mole ratio of hydrogen to ammonia is 3: 2.

Sorry im just trying to get answers like you are