It is apparent that 2 32=- 2NH When expressed using different species. the rate of the reaction may attain different values. which is not convenient and sometimes may even cause some confusion
2 2 3 2 1 3 1 N H NH r = r = r It is apparent that When expressed using different species, the rate of the reaction may attain different values, which is not convenient and sometimes may even cause some confusion
Definition: extent of reaction or the advancement(5) Vi where v is the stoichiometric coefficient of the reaction
Definition: extent of reaction or the advancement () i i i n n − ,0 = where i is the stoichiometric coefficient of the reaction
Definition The true rate of the reaction (D) dt
Definition: The true rate of the reaction (J): dt d J =
For general reaction: aA+bB→>gG+hH When the extent of reaction is ds ds B dnG= h H b
For general reaction: aA + bB → gG + hH When the extent of reaction is d h dn g dn b dn a dn d A B G H = − = − = =
J ds 1 dna 1 dng 1 dng 1 dnH dt b dt g dt h dt When the reaction takes place in a container with constant volume Definitions
dt dn dt h dn dt g dn dt b dn dt a d J 1 A 1 B 1 G 1 H = = − = − = = When the reaction takes place in a container with constant volume Definition: V J r =