In Dumas method one gram of carbon compound gives 50 mL of N_2 at 300K and 740 mmHg pressure. If the aqueous tension at 300K is 15 mmHg, what is the percentage of nitrogen in it?

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Accepted Answer

Correct answer: A. (a) p_1V_1T_1= p_2V_2T_2 ⇒ 725 50300= 760 V_2273 ⇒V_2= 725 50 273300 760=43.4 mL ⇒22400 mL ofN_2 ≡28 g ofN_2 at STP ⇒43.4 mL ofN_2 ≡ 28 43.422400=0.054 g ofN_2 \% mass ofN_2= 0.054 g1 g 100=5.4 \% .

$In Dumas method one gram of carbon compound gives 50 mL of N_{2} at 300 K and 740 mmHg pressure. If the aqueous tension at 300 K is 15 mmHg, what is the percentage of nitrogen in it?$

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