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Describe each step of the ICEEKU process in the determination of Kc from molar values
Initial amounts of each reactant and products in moles. Change in the moles of each substance. Equilibrium number of moles for each substance. Equilibrium concentration of each substance (moldm^-3). Kc expression (and calculation). Units
What is Kp?
Equilibrium constant for partial pressures
What is the relationship between Kp and Kc?
Proportional
What does partial pressure mean?
In a gas mixture the partial pressure, p, of a gas is the contribution that the gas makes towards the total pressure, P
What does the sum of the partial pressures of each gas in a system equal to?
The total pressure of the system
What are the possible units for pressure?
Pa, kPa, atm, or MPa
What does mole fraction mean?
The mole fraction of a gaseous substance is its number of moles divided by the total number of gaseous moles in a system
What should all the mole fractions in a system always add up to?
1
Kp is only constant for a specific constant ……..
temperature
Why is the expression for Kp slightly different to the expression for Kc?
They are similar but Kp has no square brackets - they are rounded brackets with a p in front of each
Describe each step of the ICETMKU to find Kp
• Initial amounts of each reactant and product in moles 2. Change in the moles of each substance 3. Eqm no. moles for each substance 4. Total moles at eqm 5. Mole fraction of each substance 6. Kp expression (and calculation) 7. Units
What is Kc/p a measure of?
How far a reaction goes
Where would the position of equilibrium lie if kc/p was exactly one, more than one and less than one?
Exactly one = eqm must lie directly between reactants and products. More than one = eqm lies to RHS. Less than one = eqm lies to LHS
What is the only factor that affects value of Kc/p?
Temperature
How would you explain the effect of temperature on the value of Kc/p in an exam question in 3-4 points?
• State which way eqm will shift and why 2. State how the ratio of the Kc/p will change 3. State that Kc/p is increased or decreased 4. May have to state if yield increases/decreases
How would you explain the effect of concentration/pressure on the value of Kc/p in an exam question in 4-5 points?
• Temporarily the ratio of the expression will increase/decrease 2. State which way eqm will shift and why 3. State how the expression must change so that 4. Kc/p remains unchanged 5. May have to state if yield increases/decreases