Chapter 12 - Stoichiometry - 12.1 The Arithmetic of Equations - Sample Problem 12.2 - Page 388: 3

44.8 L H2 + 22.4L O2 -> 44.8 H2O

To interpret the equation for moles, molecules, and volumes of gases at STP recall that the coefficients in the balanced chemical equation represents the number of moles and molecules. Also remember that 1 mol of any gas at STP (Standard Temperature and Pressure) occupies a volume of 22.4L.