Using f G o given below for the reactants and products to calculate (1) the stan

Question

Using fGo given below for the reactants and products to calculate (1) the standard Gibbs energy rGo (kJ/mole)= ___________. Please enter your answer with one decimal. for example, 100.345 is written as 100.3, and pay attention to the sign. and (2) the equilibrium constant K= __________ at 25oC for the reaction.

                                                                  

Please answer, thank you.

                                               SO2 (g)    +   ½ O2(g)    SO3(g)   fGo (kJ/mol) -300.1 0         -374.2

Explanation / Answer

Go = fGo (SO3) - fGo(SO2)
= -374.2 - (-300.1)
= -74.1 KJ/mol
Answer: -74.1 KJ/mol

Go = -74100 J/mol
T = 25 oC = 298 K

use:
Go = -R*T*ln Kc
-74100 = -8.314*298*ln Kc
Kc = 9.75*10^12
Answer: 9.75*10^12

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