The bar graph shows the cost per megawatt-hour comparison of various renewable and nonrenewable energy sources in the United States. The blue portion of the bars represents the cost of electricity. The red portion represents the additional system costs of harnessing that type of energy. Systems costs may include equipment expenses and costs of connection to a power grid.

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Sorry i dont understand the question can you rephase it?

1) according to the law of conservation of mass ,in all chemical reactions total mass is unchanged

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 -