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What is KC and Kp?

Kp And Kc are the equilibrium constant of an ideal gaseous mixture. Kp is equilibrium constant used when equilibrium concentrations are expressed in atmospheric pressure and Kc is equilibrium constant used when equilibrium concentrations are expressed in molarity. For many general chemical reactions aA + bB ⇋ cC + dD.

byjus.com - Relation Between Kp And Kc - Formula, Units, Derivation - Byju's
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Relation Between Kp And Kc

K p And K c

K p And K c are the equilibrium constant of an ideal gaseous mixture. K p is equilibrium constant used when equilibrium concentrations are expressed in atmospheric pressure and K c is equilibrium constant used when equilibrium concentrations are expressed in molarity.

For many general chemical reactions aA + bB ⇋ cC + dD

Where a mole of reactant A

b mole of reactant B

c mole of product C

d mole of product D

Consider an example

2A (g) +B (g) ⇋ 2C (g) All in the gas phase.

The K p is given by-

(egin{array}{l}K_{p}= frac{P_{C}^{2}}{P_{A}^{2}P_{B}}end{array} )

Ideal Gas Equation

Each of these ideal gas molecules behaves similarly. So for each of them,

PV = nRT

On rearranging we get-

(egin{array}{l}P=frac{n}{V}RTend{array} )

Substituting these in equation (1)

(egin{array}{l}Rightarrow K_{p}=frac{left [ C ight ]^{2}left ( RT ight )^{2}}{left [ A ight ]^{2}left ( RT ight )^{2}left [ B ight ]left ( RT ight )}end{array} ) (egin{array}{l}Rightarrow K_{p}=frac{left [ C ight ]^{2}}{left [ A ight ]^{2}left [ B ight ]} imes frac{left ( RT ight )^{2}}{left ( RT ight )^{2}left ( RT ight )}end{array} )

On cancelling like terms and substituting

(egin{array}{l}K_{c}=frac{left [ C ight ]^{2}}{left [ A ight ]^{2}left [ B ight ]}end{array} )

(egin{array}{l}Rightarrow K_{p}=frac{K_{c}}{RT}end{array} )

Or

(egin{array}{l}K_{p}=K_{c}left ( RT ight )^{-1}end{array} )

In general,

(egin{array}{l}K_{p}=K_{c}left ( RT ight )^{Delta n}end{array} )

Where, Δn represents the change in the number of moles of gas molecules. [That is Δn = product – reactant in moles only for gas molecules] When the change in the number of moles of gas molecules is zero, that is Δn = 0

⇒ K p =K c

In general, for any chemical reactions of gas molecules the relation between K p And K c is- (egin{array}{l}K_{p}=K_{c}left ( RT ight )^{Delta n}end{array} ) (egin{array}{l}K_{c}=K_{p}left ( RT ight )^{-Delta n}end{array} )

Physics Related Topics:

Frequently Asked Questions – FAQs What are the basic properties of gases? Gases have three fundamental properties. Gases are very easy to compress. They occupy more space than solids or liquids. They typically expand to fill the spaces around them. What is the ideal gas equation? PV = nRT What is pressure? Pressure is defined as the force per unit area. What is temperature? Temperature is the measure of heat. What is an ideal gas? An ideal gas is a hypothetical gas which is made of a group of randomly-propagating point particles that intermix only through elastic collisions. Stay tuned to BYJU’S for more such interesting articles. Also, register to “BYJU’S-The Learning App” for loads of interactive, engaging physics related videos and an unlimited academic assist.

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What is normal K range?

Your blood potassium level is normally 3.6 to 5.2 millimoles per liter (mmol/L). Having a blood potassium level higher than 6.0 mmol/L can be dangerous and usually requires immediate treatment.

mayoclinic.org - High potassium (hyperkalemia) - Mayo Clinic

Hyperkalemia is the medical term that describes a potassium level in your blood that's higher than normal. Potassium is a chemical that is critical to the function of nerve and muscle cells, including those in your heart. Your blood potassium level is normally 3.6 to 5.2 millimoles per liter (mmol/L). Having a blood potassium level higher than 6.0 mmol/L can be dangerous and usually requires immediate treatment. There is a problem with information submitted for this request. Review/update the information highlighted below and resubmit the form. From Mayo Clinic to your inbox Sign up for free, and stay up to date on research advancements, health tips and current health topics, like COVID-19, plus expertise on managing health. Email ErrorEmail field is required ErrorInclude a valid email address Learn more about Mayo Clinic’s use of data. To provide you with the most relevant and helpful information, and understand which information is beneficial, we may combine your email and website usage information with other information we have about you. If you are a Mayo Clinic patient, this could include protected health information. If we combine this information with your protected health information, we will treat all of that information as protected health information and will only use or disclose that information as set forth in our notice of privacy practices. You may opt-out of email communications at any time by clicking on the unsubscribe link in the e-mail. Subscribe! Thank you for subscribing! You'll soon start receiving the latest Mayo Clinic health information you requested in your inbox. Sorry something went wrong with your subscription Please, try again in a couple of minutes Retry

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