Question

15. Iron() ions (Fe) and sulfide ions (S?) react in aqueous solution to form solid wont sulfide (FeS). Will a precipitate form if 100 00 ml of 0.0020 will a precipitate form if 100.00 mL of 0.0020M Fe(NO3), is combined with 100.00 mL of 0.0020M Nas. Fes(s) Fe (aq) + s (aq) Kyp = 6.3 x 101 16. For CO2(g) -> CO2(aq), is the entropy change positive or negative? 17. For the reaction 2C(s) + 2H2(g) -> CzH4(8) AH' = +52.3 kJxmol- and AS, = -53.07 IxKxmol-1 at 298 K. This reaction will be spontaneous at: a) no temperature. b) all temperatures. c) temperatures below 985 K. d) temperatures above 985 K. e) temperatures below 1015 K. 18. Which of the following is true for a spontaneous reaction at constant temperature? a) AS + AH/T < 0 b) AGⓇ = 0 c) ASsystem <9/T d) AH-TAS < 0 e) AS surr > 0

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Answer 1

aqueow solution into its ions 15 Fe(NO3)2 diasociales completely in (lovoml=ILL moles - concentration (ol x volume (L) moles of reCNO3)2 = = 2008 10-4 mol 0.0020M X11001001L 1000' Fe(NO3 /2 cal + feetlag 1 2.0 810-4 mol 2NO3-lag! 2x 2.0810-4 mol After disociation (10ooml=ILL volume of Maas - 100.ooml= 0.1L moles of Na2S = 0.0020M X Olh = 2.0 X 10 - 4 mol Na2S dissociater completely in aqwow solution into its long Ngos (92) After dimocation - + 2Na+ (aq) 2X200X10-4 mol 92-1993 2.0 810-4 mol

100 mL & loomL = 200.0 mL Total volume of solution - = 0.2L in Soletton aaneen [feat] = (1000 mL = 1L) = 2.0 X10-4 mol 0,2 L moles of feat Total volume 10-3M [feat] = 10-3M [52] & = 2.0810-4 mol - 10-3M moles of sin Total volume 0. 21 (52-] = 10-3M Fes(3) feet lagt & Slag1 asp = [Fe 2+ ] [92-] = 10-3 x 10 3 = 10-6. Ksp = 6.3x10-18 It means a precipitate of res will form. As Qop > kop. It means fes will precipitate out
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