Explain why mole ratios are central to stoichiometric calculations, a. You must have the balanced chemical equation and know the quantity of one substance
in the reaction
b. Mole ratios allow for the conversion from moles of one substance in a balanced chemical
equation to moles of another substance in the same equation,
c The mass of the reactants will always equal the mass of the products
d. Mole ratios are determined by the coefficients in a balanced equation

The answer for this is a

What are the options? physical property can be color, smell, opacity, viscosity, density, infra red spectrum, melting and boiling points, attraction and repulson to magnets, etc.

Answer:   d.  carbon dioxide.

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 -