Question

Assignment Score: 1879/2500 Resources by Give Up? Hint Check Answer Question 24 of 25 > Predict whether the following reactions will be exothermic or endothermic. Reaction A. N (9) + 3H2(g) — 2NH3(g) Reaction B. S(g) + O2(g) - SO,(g) Reaction C. 2H,0(g) — 2H,(9) +0,(9) Reaction D. 2F(8) - 5,() Bond H-H NEN O.O F-F H-N H-O AH°(kJ/mol) 432 942 494 155 386 459 S=0 522 Which reaction(s) are endothermic? Which reaction(s) are exothermic? OA OA OB oc OB about us Careers privacy policy terms of use contact us help o e 10:07 AM 11/2019

Answer 1

AH= Be reactants - BE products = BEN2 +3BEH2-2 BENCH E BENZ + 3 BENZ - 2 (3xN-H) = (NEN) +3(1-) - 2 (3XN-H) =942+ 3(432) – 6*386 = 942 + 1, 296 – 2316 = -78 kJ/mol 6) ANH = BES(9) + BE 02/9) - BESO, nobond as o = 0+0=0) – 2(5=o) Z 494 – 2x522 = -5

Exothermic reaction is the reaction which releases energy and will have negative sign.​​​​​​ Endothermic reaction is the reaction which absorbs energy and will have positive sign.

2 Вен,о - 2 вен, + вёо. - 3 3 хо-н) - Га (н-и) +6=0) - Ахч 59 — [2x4 3 2 + чўчі г), 036 -Le69+994 ] = Ч+3k J| sma а) ЗВЕр — Вие, — Le-] = - 1551 е -18 ky 22 -55 km C = Чg Ky d=-155 kJ

1) Reaction C is endothermic in nature as it's value has + sign (478 KJ)

Option 4 is correct.

2) Reaction B is exothermic in nature as it has - sign (- 550 KJ)

Option 4 is correct.