The equation is one to one so you can use M1V1=M2V2
so
(30ml)(.10M)=(25ml)(x)
x= .12M
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Answer:
The balanced half reaction in an acidic medium is :

Explanation:

While balancing the half-reaction in an acidic medium, we will first balance oxygen atoms by adding water:
1) Adding 1 water molecule on product side to balance oxygen atoms.

Now balance hydrogen atom by adding
.
2) Adding 2 hydrogen ions on reactant side to balance hydrogen atoms.

Now balance the charge adding electrons on the side where positive charge is mor.
3) Adding 1 electrons on reactant side to balance charge of the overall reaction:

The balanced half reaction in an acidic medium is :

Answer:
The area of the block is 150 cm
Explanation: