Question

please make sure answrrs relate to the scenario of ammonia

Background Ammonia (NH3) has a bit of an identity crisis. It can be extremely valuable and beneficial as a feedstock for fertilizer, a disinfectant, or a base for plastics and explosives. It can also be horrific-toxic, necrotic, and corrosive (fun fact: it chews away at the aluminum or silver on mirrors, which is why old mirrors often have black rings at the edges or missing flakes). It has been suggested that ammonia could also be a source of hydrogen gas for use in fuel cells. But this requires breaking it down on a massive scale, which means understanding the kinetics of ammonia's conversion to H2 and N2 is critical. which is why out The scenario The conversion of ammonia to hydrogen and nitrogen is not very efficient, even though it's only weakly endothermic (~11 kJ/mol). The addition of a solid metal catalyst can speed up the reaction. The rate law for the decomposition of ammonia is expected to be zero order with these metals at relatively low pressure and high temperatures. For example, on solid platinum the rate law is Rate = K[NH3]° = k. As the total pressure increases, however, the reaction kinetics change. At high pressure, the law becomes Rate = k[NH:][Hz] (or Rate = k*[NH3]/[Hz]). Using your chemical knowledge, explain and/or demonstrate what the rate laws tell you about the chemistry why the rate law would change at higher pressures the role of the catalyst in the different rate law how you could increase the reaction rate n this scenario . .

Answer 1

We would increase the pate by for Rakland ① Rate zk athus by adding catalyst we can increase the pate • By increasing the temp, pate with increase For Rate laul - Rate = k* [NB3] [142] By increasing the core of realtant the nate will meneese By increasing or decreasing the temp the rate will increase. -

12N1 N2 +312 AH= 11 Kffmol endothermic the wake law, Rate = K[Ng] = k - # zero orden van @ But as the total pressure increase. At high pregn Rak land is Rate = k'[N18] [42] ? 30 from the rate law it is clear that the de composition of Nity is a zem Orden (ov) pacallim. It follows all the property awardoy 20 to Zero arder. such as, its half life АК where Ao z protial com and of also follow the eph of peactant [A] = [A] -kt and we are also got to know that the Rate does't depends upon the concentration of reactant

12 N 7N2 + 32 As we know that de composition of it to a seversible in this according to La-chatelier postnuple it the Pressure increases then the equibrium for this reaction shifts towards reactant As pressure increased, TK pressure. 2 NB K N2 + 32 Thus the pate law changes meresting As we know addition of a soud Catalyst can boost up the sales of the pealtion by decres creasing the actination energy. 30 for 1 pate law, addition of catalyst increases the rate of both forward and backward process. by lowering the activation energy.