What is the best definition of energy?
a) the capacity to expert strength.
b) the capacity to measure mass
c) the capacity to do work
d) the capacity to measure heat

I believe it's C) the capacity to do work

Explanation:

Because in order to work, you need energy

in chemistry, a solution’s concentration is how much of a dissolvable substance, known as a solute, is mixed with another substance, called the solvent. the standard formula is c = m/v, where c is the concentration, m is the mass of the solute dissolved, and v is the total volume