Question

Chapter 3, Question 21 Parameterization When 2.29 g of octanol ( C3H180 ) burns completely in excess O2 gas at constant pressure and 298 K, it releases -93.0 k) of energy. X Incorrect. Write the balanced chemical equation for this reaction. Ignore aggregation states in your answer. Edit X] Incorrect. (a) What is the molar energy of combustion (in kJ/mol) of octanol ? kJ/mol (b) How much energy (in kJ) is released per mole of Oz consumed?

Answer 1

Balanced Chennical Equation i Cg HigO +250 Combustion> 8CĄ +9 420 Combustion The above equation contains equal no. of atoms on both it is a balanced one! sides, thus, a) Molar energy of combustion ergy of combustion The energy released upon combustion of 1 msk of reactants. Mpolar Man of Cetanet (68 moo) • (8x1x) + (+ (61)gmal." mol 18x1) + (10 x1 H 0 + 16 2 96 + 18 = 1309 mol-1 = 130g mol- Moles of octand = 2.29 g . 130 g mel - 0.0 18 moles Now, it is given that 2.29 g octanol burns to give - 93.0kJ energy 1. Or, 0.018 males octand burns to give -93.0 kJ energy i 1 medle octand burns to give - 93.0 kJ 0.018 medles D 1 mole octand give - 5166.67 kJual energy -- - | Molar energy of combustion of octanel= -5166-67 * Just

Tour lo b) In Previous fort (a), I mole of ectand gives - 5766.67 kJ of energy Now, from the stoichiometry of reaction, 23 mode q leads to -5166.67 kJ of energy (because this much Q combines with Imide of Otand) Val Ow MA Om use ubinis MY o Imole a leads to - 5166-67 kJ 23/2 =-5166-67 x 2 kJ 23 - X2 ş Dm 2 - 449.28 kJ of energy 1 Thus, -1949. 28 kJ energy is released fer mole of O consumed) mugle