Question 69725
E=K Cl F times 20.9/20.9 minus O2

K=1.194 times   -7
              10

Cl= 150

F= 8710

O2= 12

/= divided by

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E = [1.194 x 10^-7]*20.9/ ( 20.9-02)

COMMENT:
When you have 1.194 x 10^-7  you should move the decimal place on
the 1.194 seven places to the left to get: -0.000000194
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10^7 = 10,000,000
10^-7 = 1/10,000,000
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Now I have a question for you.
What do you mean by 20.9-02 ??
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You can respond by email.
Cheers,
Stan H.