Question

1.(3pts) Use the following data to determine the AH.. of 2 CH109) + 13 O2(g) ---> 8 CO2(g) + 10 H2O(1) Data: Substance AH(kJ/mol) Substance AH(kJ/mol CzH.(g) CH2OH() C4H10g) CH2(1) H2O(g) CO(g) O2(g) -239.0 -126.15 -156.4 -241.82 -110.53 C:H:(8) CH,OH(g) CsH (8) CH (1) H.O(1) CO2 N (8) -104.0 -2010 -146.44 + 12.0 -285.83 -393.51 0 2.(2pts) If you are given 158,0 g 0_(g) and a sufficient amount of the other reactant, calculate the heat associated with reaction in problem 1 and indicate if the heat is absorbed or evolved. Atomic masse: 0 - 16.00

Answer 1

| 26441(2) + 13.02.09) + 8002(3) + 10H20 (1) 34H*Xn=?: Aipan= { stoichiometrie co-efficient x audio (pots) -{ stoichiometrie co-efficient X 4Hj (reactants) ammont (8 anico) + 10 skip (120) -{ zan; Cahim) + is an: 6.)} =f8 máix (-393.51) KI mor! + tomat (-285-82)KJ mobi} - 2 moix (-12615) K3mg67" : + 13 mil xof Alf for 02 (9) =.ok Imot because Of is natural molecule. present in its most stable form in the nature. - -3148.08 KJ – 2858.3 KJ - (252.3 KI) = -6006.38 + 252: 3 KJ. = -5754.08 KJ : . Ahoran.i.e. enthalpy change for the said reaction is (-)5754.08 Kj.

1.58 g of Oq are supplied to react with sufficient amount of the reagent reactant eftio. 158 g of. Op = 1588 4.94 mol of Oq... 32 g moro. Tolar mass of O₂ = 32gmor &. According to the chemical reaction equations t3 moles of On reacts with sufficient Gatho involves | 13 mol of Oq reacts with sufficient. ea hio involving heat change (-5754,08) Kj. I » » ni ini B2,6-5754.08) KJ 5.4.94.n.is , in l ine 565754.08) *4.94 xt 13 | = -218 6: 55 . ... Heat associated with 158g of O₂ reaction = -2186.55 kJ. negative sign denotes that heat is released during reaction. so the reaction is exothermie in nature...