Which sentence describes the energy changes take place when this chemical reaction occurs?
N + 3H2
2NH3

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

it is the most commonly accepted one