please answer!! (I asked this before but the bots got to it :|) Porosity is the fraction of material occupied by empty spaces. It can be expressed as a percent or a decimal. Assume that the porosity of a sample of sand and a sample of gravel is the same: 30 percent (0.30). Determine the porosity of a mixture of the sand and gravel, assuming that the sand fills the spaces between the gravel.

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.

un recipient conține 6,4 moli de gaz. gazul hidrogen reprezintă 25% din totalul kilometrilor din container. în cazul în care presiunea totală este de 1.24 atm ceea ce este