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# We usually define the activity of oxygen as a_0=P_(O_2)^(1/2) A common reference state for oxygen gas is 1atm pressure at the temperature of...

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We usually define the activity of oxygen as a_0=P_(O_2)^(1/2)
A common reference state for oxygen gas is 1atm pressure at the temperature of interest.
Consequently,〖〖(a〗_0)〗_(P_(O_2 )=1) = P_(O_2)^(1/2)
When a metal is oxidized we can write M+1/2 O_2=MO, K=1/(a_M P_(O_2)^(1/2) )
At the metal oxide interface a_M=1 and K=1/〖(P_(O_2)^(1⁄2))〗_(M⁄MO)
(Question)
Write an expression for the activity of oxygen where 〖(P_(O_2)^(1⁄2))〗_(M⁄MO) is taken as our reference state where a_0=1. Relate this activity to the activity of oxygen where the reference state is P_(O_2 )=1atm.
-My question(pdf file) is attached

We usually define the activity of oxygen as ° 0 = ? ? 2 1/± A common reference state for oxygen gas is ²atm pressure at the temperature of interest. Consequently,(° 0 ) ³ ´ 2 µ1 = ? ? 2 1/± When a metal is oxidized we can write M + 1 ± ± = ·¶, K = 1 ¸ ¹ ³ ´ 2 º/2 At the metal oxide interface ° » = ² and K = 1 ´ 2 º 2 ) ¹ ¹´ (Question) Write an expression for the activity of oxygen where (? ? 2 1 ± ) » »? is taken as our reference state where ° 0 = ². Relate this activity to the activity of oxygen where the reference state is ? ? 2 = ²°¼½.

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