1.
For the gaseous reaction C2H4+H2⇌C2H6\text{C}_2\text{H}_4 + \text{H}_2 \rightleftharpoons \text{C}_2\text{H}_6, ΔH=−130\Delta H = -130 kJ mol−1^{-1} carried in a closed vessel, the equilibrium concentration of C2H6\text{C}_2\text{H}_6 can definitely be increased by