Ch16_WritingK - Writing and Manipulating K Expressions...

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Unformatted text preview: Writing and Manipulating K Expressions Adding equations for reactions S(s) + O2(g) ¸ SO2(g) SO SO2(g) + 1/2 O2(g) ¸ SO3(g) SO NET EQUATION S(s) + 3/2 O 2(g) ¸ SO3(g) SO Knet [SO3 ] [O2 ]3/2 [SO2 ] K1 = [O2 ] Writing and Manipulating K Writing Expressions Changing coefficients S(s) + 3/2 O 2(g) ¸ SO3(g) SO Writing and Manipulating K Writing Expressions Changing direction S(s) + O2(g) ¸ SO2(g) SO 2 K [SO3 ] [O2 ]3/2 [SO3 ] [O2 ]3 K [SO2 ] [O2 ] [O2 ] [SO2 ] K2 = [SO3 ] [SO 2 ][O 2 ]1/2 2 S(s) + 3 O 2(g) ¸ 2 SO3(g) K SO new SO2(g) ¸ S(s) + O2(g) S(s) Knew Knew [SO3 ]2 [O2 ]3 = ( K old )2 Knew Knet = K1 • K 2 [O2 ] 1 = [SO2 ] Kold Writing and Manipulating K Writing Expressions Concentration Units We have been writing K in terms of mol/L. mol/L. These are designated by Kc But with gases, P = (n/V)•RT = conc • RT P is proportional to concentration, so we can write K in terms of P. These are designated by Kp. Kc and Kp may or may not be the same. and may 1 ...
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