Question

value of following expression for a=-4. a²-9​

Answer 1

Answer:

Step-by-step explanation:

E  

cell

∘

​  

=0, for every concentration cell

E=0−  

n

0.059

​  

log  

[M  

+

]  

cathode

​  

 

[M  

+

]  

anode

​  

 

​  

 

=−  

1

0.059

​  

log[0.0025]

=+153 mV

It is close to 140 mV.

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Answer 2

formula=-4

a)a²-9

=-4²-9

=16-9

=7