Lithium carbonate, li2co3, contains 18.8 % lithium and is used in the treatment of mental illnesses such as bipolar disorder. what mass of lithium is present in a 1.00−g dose of lithium carbonate?

Assuming that the 18.8% composition is based on mass, therefore the mass of Lithium would simply be the product of the fractional composition and the total dose. That is:

18.8 % = 0.188

mass Lithium = 0.188 * 1.00 g = 0.188 g

0.188 g

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.