each liter of hydrazine, N2H4, has enough hydrogen for two liters of water." There is a huge error Watney’s estimation, what is it? (Hint: think phases and Avagadro’s Gas Law) Each gram of hydrazine will produce 2 grams of water. 1 liter of hydrazine will only produce 1 liter of water if they are both gases (not liquids) at the same temperature and pressure. 1 liter of hydrazine will produce 1 liter of water since Avogadro's law says that at the same temperature and pressure equal volumes contain equal number of particles (moles.) There is no telling how much water will be produced by 1 L of hydrazine.