Questions 1 and 2 refer to the following plot for the gas reaction, at 0 degree

Question

Questions 1 and 2 refer to the following plot for the gas reaction, at 0 degree C: A(g) rightarrow B(g) + C(g) At equilibrium, if the pressure of A (in atmospheres) is half the pressure of B, what is the pressure of C? [PB = 2PA ; Pc = ?] Show your work and explain your answer using labels on the graph, mathematical expressions and/or descriptive sentences. Estimate the value for the standard free energy of formation for the reactant A(g), given the following thermodynamic data for the products: Show your work and explain your answer using labels on the graph, mathematical expressions and/or descriptive sentences.

Explanation / Answer

1) at equilibrium delta G= 0

     delta G = 0 corresponding   PB X PC/ PA value from graph = 0.5

so PB X PC/ PA = 0.5 ------------------(1)

   PB = 2 PA

from (1) : 2 PA X PC/ PA = 0.5

   Pc= 1/4 = 0.25

Pc= 0.25 ----------------------------------------> (answer)

2) from the graph delta G = 6 kJ/mol

    delta G = (B+C) -A

    6 =( 0.5 + 1.0) -A

A= -4.5kJ/mol

  

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