Question

Air is a gas mixture, and consists of approximately 78% nitrogen and 21% oxygen. Calculate the mass concentrations of the gas species at standard ambient temperature and pressure.

Answer 1

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Ain qas mixture contains 789% nitrogen cu 21% augen Sie 100 ml of air has 20 ml of orggen Din it. in rogen Now, Volume oy 1 mol gas = 22.41 C = 22.4 -103 ml [As we know 11 = 103 mi) 78 - Now, 78 ml of nitrogen - mol of nitrogen 22.47 103D Now, molecular mass of nitrogeor is 28 gmolt and po gmort and molecular mass oy orygenbis 224 m 28 1000 100 22.400 30, 78 ml of nitrogen = 18 - 28 9 of nitrogen Similauly, 21 ml of onggen - 2 4 1 10 2 132 g of oxygen. Now, 100 m of air contains T8 289 of nitrogen 22.4110200 lovo ml of air contains 78 nitroge on = 0.975 g of nitrogen shqcoo Zid ain contains 4 10 3 *3 22.4 gogorarygon = 0.39 of oxygen. So, mass concentration of nitrogen 0.975 g Lt and Bygen 0.394-' at std. ambient temperature and pressure. Similarly,