In which ONE of the following equilibrium systems will an increase in the pressu

Question

In which ONE of the following equilibrium systems will an increase in the pressure have NO EFFECT on the concentrations of products and reactants? H_2(g) + F_2(g)equilibrium 2 HF(g) N_2(g) + 3 H_2(g) equilibrium 2 NH_3(g) CaCO_3(s) equilibrium CaO(s) + CO_2(g) 2 NOBr(g) equilibrium 2 NO(g) + Br_2(g) 2H_2O(g) + O_2(g) equilibrium 2 H_2O_2(g) At a certain temperature, the reaction- H_2(g) + l_2(g) equilibrium 2 Hi(g) has K_e = 54. At this temperature, in a system in which the equilibrium concentrations of H_2 and I_2 are 0.025 mol/L and 0.017 mol/L, what is the equilibrium concentration of Hl? 5.3 time 10^-4 M 2.8 times 10^-3 M 0.023 M 0.15 M 6.6 M According to the Arrhenius definition, a base is a substance that when dissolved in water increases the concentration of- hydroxide ion hydronium ion protons electrolytes cations Which equation depicts monohydrogen phosphate ion (HPO_4^2-) behaving as a Bronsted-Lowry base in water? HPO_4^2-(aq) + H_2O(l) equilibrium H_2PO_4^-(aq) + OH^-(aq) HPO_4^2-(aq) + OH^-(aq) equilibrium PO_4^3-(aq) + H_2O(l) HPO_4^2-(aq) + H_2O(l) equilibrium PO_4^3-(aq) + H_3O^+(aq) 2 HPO_4^2-(aq) + O^2-(aq) equilibrium PO_4^3-(aq) + H_2O(l) 2 HPO_4^2-(aq) + H_2O(l) equilibrium 2H_2O(l) + P_2O_7(s)

Explanation / Answer

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Changes in pressure ordinarily do not affect the concentrations of reacting species in condensed phases because liquids and solids are virtually in compressible. Nevertheless, concentrations of gases are greatly affected by changes in pressure.

Remember the ideal gas law PV=nRT

P and V are related to each other inversely. The greater the pressure, the smaller the volume, and vice versa.

In general, and increase in pressure (decrease in volume) favors the net reaction that decrease the total number of moles of gases, and a decrease in pressure (increase in volume) favors the net reaction that increase the total number of moles of gases.

a) The pressure HAS NOT AFFECT: The number of moles of products is equal to the number of moles of reactants, so a change in pressure has no effect on the concentration of products and reactants.

b) The pressure has effect: There are 2 moles of gaseous products and 4 moles of gaseous reactants. Therefore, the net reaction will shift toward the products, changing the concentrations of products (increasing them) and reactants (decreasing them)

c) The pressure has effect: There is 1 mole of gaseous products. Therefore, the net reaction will shift to the left, toward the reactants

d) The pressure has effect: There are 2 moles of gaseous reactants and 3 moles of gaseous products. Therefore, the net reaction will shift to the left, toward the reactants

e) The pressure has effect: There are 2 moles of gaseous products and 3 moles of gaseous reactants. Therefore, the net reaction will shift toward the products, changing the concentrations of products (increasing them) and reactants (decreasing them)

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