Changes

: The [[Yield (Chemistry)|yield]] can be improved by increasing the [[pressure]] inside the [[Reaction Vessel|reaction vessel]] which favours the forward [[Chemical Reaction|forward reaction]].

: The [[Haber Process]] is essential to modern [[agriculture]] as it produces [[Nitrogen]] based [[fertiliser]]s for [[crop]]s. Without this the [[soil]] would run out of [[Nitrate]]s and [[plant]]s would not longer be able to [[growth|grow]].

: The [[Iron]] [[catalyst]] increases the [[Rate of Reaction|rate of reaction]].

: However, this works for both the [[Forward Reaction|forward]] and [[Back Reaction|back reaction]] so it does not affect the [[Equilibrium Position|equilibrium position]].

: Using the [[Balanced Symbol Equation|balanced symbol equation]] for this [[Chemical Reaction|reaction]]:

: <chem> 3H2(g) + N2(g) <=> 2NH3(g) </chem>

: It can be seen that 4 [[Mole]]s of [[reactant]]s is needed to [[product|produce]] 2 [[Mole]]s of [[product]]s. This means a higher [[pressure]] will force the [[Equilibrium Position]] to favour the [[product]]s over the [[reactant]]s as they take up less [[Volume (Space)|volume]].

: The [[temperature]] affects both the [[Rate of Reaction|rate of reaction]] and the [[Equilibrium Position]].

: A higher [[temperature]] increases the [[Rate of Reaction|rate of reaction]] because it causes the [[particle]]s of [[reactant]] to [[Collision Theory|collide]] more frequently.

: A higher [[temperature]] favours the [[Back Reaction|back reaction]] because the [[Forward Reaction|forward reaction]] is [[exothermic]] and the [[Back Reaction|back reaction]] is [[endothermic]].

: To optimise the [[Rate of Reaction|rate of reaction]] and the [[Forward Reaction|forward reaction]] the optimum [[temperature]] is 450°C. This [[temperature]] [[product|produces]] the best [[Yield (Chemistry)|yield]] in the shortest [[time]].