text: 4 grams of CH_4 which is 4/16(molar mass)=.25 moles\nmultiply.25 moles of CH_4 by two because of the two moles of water.\n.5moles of water and at STP volume of one mole of any gas is 22.4 L\nso multiply .5moles by 22.4 and get 11.2