Many pain relief pills have powder that is enclosed inside a capsule. Why might this type of medicine work faster than a tablet if they both
have the same amount and type of medicine?

Capsules break down faster than tablets and gives relief faster .

Explanation:

Capsules work faster than tablets because they break down faster than tablets and as a result capsules give faster relief than tablets.Capsules don't have a bad taste and bad odor on the other hand tablets have bad taste. Tablets are normally flat in nature on the other hand capsules are cylindrical. Inside a capsule there is a powder or sometimes jelly . Capsules are absorbed fast in the body than the tablets. Thus after consuming capsules the patients get the relief at a fast rate.

1) according to the law of conservation of mass ,in all chemical reactions total mass is unchanged

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 -