previous | 18 of 18 | re Correct Based on the magnitude of K, we know that this
ID: 1017703 • Letter: P
Question
previous | 18 of 18 | re Correct Based on the magnitude of K, we know that this reaction has practically gone to at equikbrium Standard versus Nonstandard Conditions In Part A, we saw that AG242.1 kJ for the hydrogenation of acetylene under standard conditions (all pressures equal to 1 atm and the common reference temperature 298 K in Part B you will determine he G for the reaction ur er a given set of nonstandard condi m Part B At 25 °C the reaction from Part A has a composition as shown in the table below SubstancePressure (atm) 5.35 4 25 H2(g) C2Hs(g)525x10? what is the tree energy change, G, in klopules tor the reaction under these conditions? numerically in kilojoules. kJExplanation / Answer
C2H2 + 2H2 ---> C2H6
Kp = P(C2H6) / {P(C2H2)*p(H2)^2}
Kp = 5.35 / {5.25*10^-2 * (4.25)^2}
= 5.642
use:
Kp = Kc*(R*T)^delta n
5.642 = Kc*(0.0821*298)^(1-3)
5.642 = Kc*(0.0821*298)^(-2)
Kc = 3377
use:
delta G = delta Go + R*T*ln Kc
delta G = -242100 + 8.314*298*ln 3377
delta G = -221970 J
= 221.97 KJ
Answer: 221.97 KJ
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