# Chapter 15 Lecture 4 (1).pptx - Chapter 15 Lecture 4 u2022...

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Chapter 15 Lecture 4 Relating Kc and Kp Relating Kc and Q,
K c and K p Connection In calculating K p , the partial pressures are always in atm. The values of K p and K c are not necessarily the same because of the difference in units. The relationship between them is as follows: K p = K c × ( RT ) Δ n Where Δ n is the difference between the number of moles of reactants and the number of moles of products (products minus reactants). aA + bB cC + dD, where A, B, C, and D are all gases, and a, b, c, and d are their respective coefficients n = ( c + d ) – ( a + b ) Only include gases in the expression for K when determining Δ n RT is used for unit conversion.
Relationship between K c and K p 2NO 2 ( g ) N 2 O 4 ( g ) ; K p = K c × ( RT ) Δ n
Relationship between K c and K p H 2 ( g ) + I 2 ( g ) 2 HI ( g ) ; K p = K c × ( RT ) Δ n
Relationship between K c and K p N 2 ( g ) + 3H 2 ( g ) 2 NH 3 ( g ) ; K p = K c × ( RT ) Δ n