A gas sample in a rigid container at 455 k is cooled to 273 k where it has a pressure of 1 atm. What was the original pressure of the gas in mmHg

Ithink it’s one of those things that you put the object on

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 -

D=m/v =57.9/3 = 19.3 g/cm^3