Question

(1) (12 pts) When H2S(g) is bubbled into aqueous nitric acid solutions, S(s), NO2(g), NO(g), N2(g), and NH4+(aq) are all formed.

(a) (8pts)Writethefourbalancedchemicalreactions(usingonlyelectricallyneutralspecies)thatdescribethis process.

(b) (4 pts) For each reaction in part (a), evaluate the number of moles of electrons transferred per mole of H2S(g).

Answer 1

0 H₂S (g) + 2 HNO 3 - 3 (6) + 2N02(g) + 2 H20 (1) @ 3H25 (8) + 2 HNO3 () = 38() + 2NO (8) + 4H20(e) |_ @ 5 H25 (9) +2 H N03 () = 5568) + N2 (9) + 6H20(8) @ 4H2S (7) + HNO3 () = 45(1) + NH4 H (car) + 2 H24 $20 -> S + 2e 2003 +44 +2e - 2002 + 2H2O

о 19 г. 2. 20 +4 н® + 2e 2 кг 2 + 2H2O 20 20 50+ а во 2 ,0 + н® + 60 2 2 + 4H2O (0) see c+Фе 2 год° +12 Н + (0e N, + 6H2O М 4 с 10 ye+ ge ко, он не у кн, - он + 2H2O
In all these processes we see 2 moles of electrons being transferred per mole of H2S and overall electrons transferred are 2 moles, 6 moles, 10 moles and 8 moles electrons by 1 mole, 3 moles, 5 moles and 4 moles of H2S respectively.