Optimising yield Flashcards
(9 cards)
how is reaction rate and product yield maximised
by manipulating the equilibrium position and controlling the rate through temperature and catalysts
equation to calculate percenatge yield
actual yield/theoretical yield x 100
how is actual yield determined
through the position of equilibrium, reaction rate, loss of reactants/products during transfer between reaction vessels/seperation and purification steps
what is the haber process
when nitrogen gas and hydrogen are reaction to produce ammonia
haber process reaction
N2 (g) + 3H2(g) = 2NH3(g) H= -92KJmol-1
what is the effect of increasing temperature on the haber process
decreases equilibrium yield, increases reaction rate
effect of increasing pressure on haber process
increases equilibrium yield, increases reaction rate
effect of catalyst on haber process
no effect on equilibrium yield, increases reaction rate
what are the conditions of the haber process
high pressure 100-250atm, moderate temperature= 350-550degrees celcius, porous iron/iron oxide catalyst, removal of product as it forms and recycling of the unreacted reagents
