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OpenStudy (anonymous):

rank the 4 gases (air,exhaled air, gas produced from decomposition of H202, gas from decomposition of NaHCO3) in order of increasing concentration of oxygen

OpenStudy (mertsj):

My guess is: exhaled air, air, from NaHCO3, from H2O2

OpenStudy (chmvijay):

air = 70 % N2 exhaled air =70%N2 + some less O2 compared to only air 2H2O2=2H2O+O2 NaHCO3=2NaHCO3 → Na2CO3 + H2O + CO2 = No O2 gas from decomposition ssoooo NaHCO3 <exhaled air <air <H2O2

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