Hydrogen gas reacts with oxygen to produce water. if a student fills a 250-ml flask with hydrogen at stp. what volume of oxygen is necessary for the reaction
the balanced equation for the above reaction is; 2H₂(g) + O₂ --> 2H₂O Stoichiometry of H₂ to O₂ is 2:1 This means that the molar ratio in which H₂ reacts with O₂ is in the 2:1 ratio. At constant temperature and pressure , number of moles are directly proportional to volume of gas. Therefore volume ratio in which H₂ reacts with O₂ is 2:1. volume of 2 mL of H₂ reacts with 1 mL of O₂ therefore 250 mL of H₂ reacts with - 1/2 x 250 = 125 mL volume of 125 mL of O₂ is required for the reaction
