For the reaction : C2 ​H6 (g) ⇌ C2H4(g)+H2(g) Kp ​ is 5×10^−2 atm. Calculate the mole percent of C2 ​H6 ​(g) at equilibrium if pure C2 ​H6 at 1 atm is passed over a suitable catalyst at 900K: