Initially at t = 0 gas A was present along with some amount of gas C. At At t = 0, the mole fraction of gas C is 13. After some time t=t1, the total pressure is half of the final total pressure at t=tx (a very long time). Assume this decomposition to follow first order kinetics (at a constant temperature). It is also given at t=tx, the final total pressure is 35 bar.
Ratio of rate constant at t = 0 to t=t1 to t=tx is: