4.5 moles each of hydrogen and iodin heated in a sealed 10 L vessel. At equilibrium 3 moles of HI were found. The equilibrium constant for <br> $H_{2(g)} + I_{2(g)} \leftrightharpoons 2HI_{(g)} $ is :

Question

( A ) 20
( B ) 0.33
( C ) 1
( D ) 5