<P> A Hofmann voltameter is often used as a demonstration of stoichiometric principles , as the two - to - one ratio of the volumes of hydrogen and oxygen gas produced by the apparatus illustrates the chemical formula of water , H O. However , this is only true if oxygen and hydrogen gases are assumed to be diatomic . If hydrogen gas were monatomic and oxygen diatomic , the gas volume ratio would be 4 : 1 . The volumetric composition of water is the ratio by volume of hydrogen to oxygen present . This value is 2 : 1 experimentally ; this value is determined using Hofmann 's water voltameter . </P>
<P> A Hofmann voltameter is often used as a demonstration of stoichiometric principles , as the two - to - one ratio of the volumes of hydrogen and oxygen gas produced by the apparatus illustrates the chemical formula of water , H O. However , this is only true if oxygen and hydrogen gases are assumed to be diatomic . If hydrogen gas were monatomic and oxygen diatomic , the gas volume ratio would be 4 : 1 . The volumetric composition of water is the ratio by volume of hydrogen to oxygen present . This value is 2 : 1 experimentally ; this value is determined using Hofmann 's water voltameter . </P>
apparatus used to determine the volumetric composition of water
apparatus used to determine the volumetric composition of water
Hofmann voltameter
Hofmann voltameter