Solve the following problems. Show your work and include the units 8. How many moles is 9.3 x 1025 atoms of Pb? 9. How many representative particles are in 2.73 moles of MgI? 10. What is the gram molecular mass of C2H6? 11. Find the mass of each of the following A. 3.65 mol K S04 B. 2.61 mol H2O2 C. 2.60 x 1024 molecules of CH, D. 0.70 L Kra STP 12. What is the density of 1 mole of N O gas at STP?

b.final

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.