[" In Duma's method for "],[" estimation of "],[" nitrogen,"0.25g" of an "],[" organic compound "],[" gave "40mL" of "],[" nitrogen collected at "],[300K" temperature "],[" and "725mm],[" pressure.If the "],[" aqueous tension at "],[300K" is "25mm," the "],[" percentage of "],[" nitroden in the "]