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Unformatted text preview: a gas may be: Ø increased by decreasing the volume, at constant temperature (achieved by decreasing the size of the reaction vessel) Ø decreased by increasing the volume, at constant temperature (achieved by increasing the size o f the reaction vessel)
· To predict the equilibrium shift caused by a change in pressure, consider the fo llowing: The effect of increasing the pressure (decreasing the vo lume) of the equilibrium system = Increasing the concentration of gaseous reacting species (reactants and products) Example 1: (One reacting species is a gas) CaCO3 (s)
Stress Decrease in vo lume Increase in vo lume ¾¾
¬¾ ¾ Pressure Change increased decreased CaO (s) Direction of Equilibrium shift Reverse ( ¬¾ ) ¾
(removes gas) Forward ( ¾¾ ) ®
(adds gas) 25 + CO2 (g) Amounts of Reacting Species CaCO3 CaO CO2 increased decreased decreased decreased increased increased Chemistry 102 Chapter 14 Example 2: (All reacting species are gases)
· Number of mo les of reactants ¹ Number of mo les of products N2 (g) + 3 H2 (g) ¾¾
¬¾ ¾ 2 NH3 (g) 4 moles 2 moles Stress: Press...
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