If the following are energy returned on investment (eroi) ratios for particular energy sources, which of the following is the most efficient?
3
10: 1
48/4
2: 1

48/4

Explanation:

The Energy returned on investment is the ratio among the total energy produced and the energy required to produce this final amount.

In this way the biggest the ratio, the biggest is the gain of energy, that is reason why 48/4 = 12 is the biggest ratio, that means that you gain 12 times the energy that you need to produce it.

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definition

                    entropy is a measure of the randomness or the extent of disorder of a chemical process.

                      enthalpy is a measure of the heat change of a reaction occurring at a constant pressure.

measurement units:

                        entropy is measured in joule per kelvin (jk⁻¹)   whereas enthalpy is measured in joule per mole (jmol⁻¹)

requirements:

                            entropy has no requirements or limits, and its change is measured by the division between the heat change of the chemical process and the temperature.

                              in contrast, enthalpy can only be related to the heat change of the reaction under standard conditions.