In 2H2+O2------->2H2O we know 2 moles of h2 react with one mole of O2 to produce 2 moles of h2O in the following reaction easily find the ratio of mass by multiplying mass of each element with 6.022×10^23 than why do we say that stoichiometric coefficient tell us only about ratio of moles and not about ratio of mass as in every reaction we are able to find ratio of mass.

Stoichiometric analysis co-efficient is the number of atoms of a particular element required required to make a molecule of a compound in a reaction. Mass is rather a derived quantity as always a complete atom participate in compound formation. Thus, the stoichiometry of a compound or its molecule is decided by the number of atoms of its constituents and not by its mass. 

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