When can all the coefficients in a balanced equation represent volume ratios? when reactants and products are solids at stp when reactants and products are liquids at stp when reactants and products are gases at stp any time a reaction happens at stply. com/question/8039553?

when reactants and products are gases at STP.

Justification:

1) STP stands for standard temperature (0°) and pressure (1 atm).

2) According to the kinetic molecular theory of the gases, and as per Avogadro's principle, equal volumes of gases, at the same temperature and pressure, have the same number of molecules.

3) Since the coefficients in a balanced chemical equation represent number of moles, when reactants and products are gases at the same temperature and pressure, the mole ratios are the same that the volume ratios, and then the coefficients of the chemical equation represent the volume ratios.

the answer is a and have a great day