Question

I was wondering how i got this wrong

Assignment 19 (Chapter 9) Formation Reactions a Review Constants Periodic Table The standard heat of formation Alle celined AB the enthalpy change for the formation of one mole ol Anchromis cangiment Alamans in their standard states. Thus, Alements in their standard starea have Ali' - Heal of formation values can be used to calculate the enthalpy change of any Part A e qual 10 AH of the products)?You do not need to look up any values to answer this cuestion For which of the folowing reactions is A Check all that apply. View Available Hints) Conscer, for example, the reaction 2NO(g) + O2/d) = 2NO(A) with heat of formation values given by the following table: Substance AHY ce moli NO g) 90.2 Na(s) + F.(g)+NaF(s) H,O,(g) 0,($)+H.O(g) Na(s)+F. (1)NaF (s) 2Na(s) + F(b)+2NaF (s) 2H2(g) + O2(g) +2H2O16) H.(x)+10.(x)-H2O() 0 02 NO.) Then the standard heat of reaction for the overall AH AH (pruducts)- 2(33.2) - - 114 A (reactants) 2190.2) + 0) = - Subm Previous Answers X Incorrect; Try Again; 4 attempts remaining Look again at the cuellicients in the reactions. The heat of formation is defined by a reaction that forms one mole of product You may want to review Hint 3. Select the action for the formation of water. Part B The combustion of hepiane, Cl18 cours via the reaction CyHg) - 110 (8)+70021B) -H,018) with heat of formation values given by the lolowing table: AH Substance mol CHole) COR H2O(C) -187.2 -393.5 -241.8

Answer 1

Part-A - Na(s) + / F2 (g) - Nafls) "2 for these two & reaction, H₂(g) + / 02 (9) - H₂Olgs SoH = Hreaction Because molecules NaFis) & Ho Olge are formed from elements present in standard state as well as only one mole of Naf(s) and H₂O(gs are formed. h Ca Hig (g) + 110₂(g) - 7602(gs of 8 H₂O(gs AM = EAH (Product')- Sahi (Beactants) = 7(-393.5)+81-241,8) – (-187.g) 7-2754.5–1934.4+ 187,9 JH = - 450) Koristelle