19.1-21. effect of a slow reaction rate on diffusion. gas a diffuses from point 1 to a catalyst surface at point 2, where it reacts as follows: 2a → b. gas b diffuses back a distance δ to point 1. derive the equation for na for a very fast reaction using mole fraction units xa1, and so on. for dab = 0.2 × 10–4m2/s, xa1 = 0.97, p = 101.32 kpa, δ = 1.30 mm, and t = 298 k, solve for na. do the same as in part (a) but for a slow first-order reaction where k1′ is the reaction velocity constant. calculate na and xa2 for part (c) where k1′=0.53×10−2m/s.

i just learnt this recently but i need to look through my notes again

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.

the objects have the same charge is correct.

nathan lee