How many liters of hydrogen gas are needed to react with cs2 to produce 2.50 l of ch4 at stp? 4h2(g) + cs2(l) → ch4(g) + 2h2s(g)?

At  stp  1  mole  of a  gas   =22.4l
calculate   the  number  of  moles of CH4 formed
  2.50/22.4=0.1116moles
from the  reaction  above  the   reacting   ratio  of   H2  to   CH4   is      4:1
therefore  the  moles  of  H2  reacted  is  0.1116  x4  =0.4464moles
volume  of  H2  =0.4464  x  22.4  l =9.99l 

Enzyme make a hormone as a catalyst