A teacher has given a lab student a white chemical sample and asks her to confirm that it contains 7.03 × 1023 formula units of sodium hydroxide (NaOH). Using the balance in the laboratory, what mass of NaOH would the student have to find to verify that her teacher was correct? Round your answer to 3 significant figures.

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The answers are 3.c kelvin4.b liquids only

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 -

So the main goal for the elements is stability which is a complete/full valence shell and typically the magic number for a stable element is 8 valence electron but not always. so elements to the left of the periodic table tend to be way less stable then those on the right, so the elements on the left are much more reactive.