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1.42L of the 9.0M NaOH are required

Explanation:

Molarity is an unit of concentration in chemistry defined as the ratio of the moles of a solute (In this case NaOH) and the volume of the solution.

To solve this question we must know the moles of NaOH required in 4.25L of a 3.0M NaOH as follows:

4.25L * (3.0moles / L) = 12.75 moles of NaOH are required

As all NaOH must come from the 9.0M NaOH the volume we need is:

12.75 moles NaOH * (1L / 9.0 moles NaOH) =

1.42L of the 9.0M NaOH are required

The answer for this question is d. none of these

Okay well gravitational energy is matter forced by gravity making energy though the kinetic energy then the electric energy produces electricity from the kinetic energy and the kinetic energy gets its energy from the gravitational energy. was that the answer you wanted or something else?