There are equal atoms of 20381Tl and 20581 Tl .Equal atoms of Superscript 203 Subscript; 81 Tl and Superscript 205 Subscript ; 81 Tl. There are___in a sample of thallium because the mass number of thallium, which is 204.38 a mu, is___the mass number of the isotope present in the highest percentage. In a sample of thallium because the mass number of thallium, which is 204.38 amu, is closer to.

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.