Question

es often TCinerase) Lathce Endg Name: Number: Activity Section: 1:30 PM, 2:30 PM, 3:30 PM, 4:30 PM (circle one) 1. How will the enthalpy change (AH) values for the following reactions compare? (You don't n- to do any calculations here. Just think about the steps required to make the calculation.) H2(g)+½ O2(g)-> H2O(g) vs. 2H2(g) + O2(g) -> 2H2O(g) The reacton would dubu Sne tottu equatio re Scrvc hon s muth ply b we Lofi the ong AH=+40 kJ 2 (AH=-50 kJ -- 20 kJ Given these reactions: A-2B 2(B C AH=- 2C-D Calculate the AH in kJ for the reaction: D +A 4C -20 +40-4c -lou 38-20 20 -80 4I0 ven the data below, calculate the enthalpy change for the synthesis of ammonia (NH3) fro Crogen (N2) and water. Is the reaction endothermic or exothermic? tarvese chens AH=+92 kJ AH=-484 kJ H3(g) (g)+O:(g) +6H2O(g) -> 302(g) + 4NH3(g) ->N2(g)+3H2(g) 2H2O(g) 3 AH=?

Answer 1

Yes your answer is correct here As we have to multiply whole of the equation by 2, the enthalpy change (OH) also becomes double de A + 2B DH = +40 kJ . a-tih B DH = -50kJ --- für D~ 20 DH = +20 kJ - - Cail

for performing (0) + 2x(ú) + (ü) A 28 28 - 26 D - 2c - A+ D - 4 L So, final AH will also follow this que = 40 + 2 x(-50) +20 - -40 kJ