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Among the following nitrogen compounds, which one has lowest percentage of nitrogen?

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Important Questions on Stoichiometry (Mole Concept)

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How many moles of O2 are evolved when one mole of MnO4- is reduced to Mn2+ by H2O2 in an acidic medium?
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Conversion of molecular oxygen to ozone takes place only to the extent of 15%. Calculate the mass (in g) of ozone that is formed from 67.2 L of oxygen at STP.
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20 g of CaCO3 on heating produces x amount of CO2. If the final weight of CaCO3 after the reaction is 5 g, the amount of CO2 liberated in L at STP is
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Molality m of 18 M H2SO4 is, approximately [d=1.84 g cm-3, Molar mass of H2SO4=98 g mol-1].
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A fuel cell generates electricity by using methanol as fuel and O2 as the oxidant. Calculate the equivalent weight of methanol.