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An ideal gas at STP occupies 22.4 liters. Calculating Oxygen as if it were an ideal gas there are . 893 moles of Oxygen in 20.0 liters.
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.
entropy is measured in joule per kelvin (jk⁻¹) whereas enthalpy is measured in joule per mole (jmol⁻¹)
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.
i think its 5049.
i hope this !