3 at 500 K. In a 2 litre vessel 60 gm of water gas (equimolar mixture of CO (g) and H2 (g)] and 90 gm of steam is initially taken. What is the equilibrium concentration of H2 (g) at equilibrium (mole/L)? (A) 1.75 (B) 3.5 (C) 1.5 (D) 0.75