___ H2S (g) + ___ O2(g) --> ___ SO2(g) + ___ H2O(g)
If given 124.12 grams of Hydrogen Sulfide (H2S), how many Liters STP of Oxygen (O2) will be consumed?

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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 -

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