State Graham's law of diffusion. A vessel of volume 100ml contains 10% O2 and 90% unknown gas. The gases diffuse in 86

sec. through a small hole of the vessel. If pure oxygen under the

same condition diffuses in 75 sec. Find the molecular mass of

unknown gas.

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Naoh + hbr -> nabr (salt) + h2o ca (oh)2 + 2hbr - - - > ca (br)2 + 2h2o

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 -