Question

Hydrogen cobines with o2 to form h2oand h2o2 state and explain related law of chemical combination

Answer 1

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Water is H2O so the stoichiometry is that one oxygen atom combines with 2 hydrogens whilst hydrogen peroxide is H2O2 so the stoichiometry is that 2 oxygen atom combines with 2 hydrogens. However the "ratios of atoms" in each molecule are 1:2 and 1:1 respectively. so the "proportions" are these.