2. Naturally occurring lithium consists of two isotopes: (92.5%), with an isotopic mass of 7.016 amu and 7.5%), with an isotopic mass of 6.015 amu. What is the atomic weight of lithium?
97Check your answer in a periodic table.

oxygen, selenium, tellurium, and polonium.

they're all from the same group as sulfur (group 16).

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.

air

in a tire you fill a tire with air

then a couple days later you check the air pressure in the tire

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