Part A Acetylene, C2H2, can be converted to ethane, C2H6, by a process known as

Question

Part A Acetylene, C2H2, can be converted to ethane, C2H6, by a process known as hydrogenation. The reaction is C2H2 (g) +2H2 (g) C2 H6 (g) Given the following data at standard conditions (all pressures equal to 1 atm and the common reference temperature 298 K), what is the value of K p for this reaction? Substance kJ/mol) C2H2 (g) 209.2 H2 (g) C2H6 (g) 32.89 Express your answer using two significant figures. 2.7x1042 Submit Hints My Answers Give Up Review Part Correct Based on the magnitude of K, we know that this reaction has practically gone to completion at equilibrium.

Explanation / Answer

We find   Q of reaction , Q means reaction quotient

C2H2 (g) + 2H2 (g)----> C2H6 ( g )

Q   =   pC2H6 / ( pC2H2 x pH2^2)    = ( 0.0225 / 5.75 x 3.55^2)   = 3.104*10^-4

Now dG = dGo + RT ln K

dG = -242100 + ( 8.314 x 298) ln ( 3.104*10^-4)             ( dGo units taken in J as we have R in J)

= -242100-17745.7

    = -262112.95 J =   - 262,11 KJ

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