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Problem- Looking at 2A(g) - B(g): If the initial partial pressure of A is 3.0atm and the initial partial pressure of B is 0atm, what is the value of K if 33% of A has reacted to reach equillibrium?

- this question was from probem 80 in Zumdahl General Chemistry book, chapter 10. In the Chegg solution, a solution was proposed that either I don't understand or is wrong. The chegg solution says that the equillibrium pressure of A is .33(3), but I believe it should be 3-(.33*3), because if 33% reacted, there should be 67% left right?

I desire help for above question. Illustrate each step for the above problem.

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