In a sealed respirometer, CO2 molecules are being removed from the vial as precipitate; thus, "n" decreases. Refer again to the equation. What effect would decreasing the number of gas molecules in the vial have on pressure within the vial and movement of water through the pipette?

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The answer is b because a,c,and d are opinons

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 -