Question

ue significance of the negative sign associated with this value? Choose one: O A. Energy is absorbed from the surroundings during the reaction. O B. Energy is destroyed during the reaction. C. Energy is released into the surroundings during the reaction. O D. Energy is created during the reaction. (b) Why is the magnitude of this value so much larger than the heat of vaporization of water (AHvap - 41 kJ/mol)? Choose one: O A. More energy is needed to form attractive forces between water molecules than to break H-Hand O-O bonds and form H-O bonds. O B. More energy is needed to break attractive forces between water molecules than to break H-Hand 0-0 bonds and form H-O bonds. O C. Less energy is needed to form attractive forces between water molecules than to break H-Hand O-O bonds and form H-O bonds. O D. Less energy is needed to break attractive forces between water molecules than to break H-Hand O- bonds and form H-O bonds. OF 11 QUESTIONS COMPLETED < 09/11 > su

Answer 1

******* In water's hydrogen bonds, the hydrogen atom is covalently attached to the oxygen of a water molecule (492.2145 kJ ˣ mol^-1 [350]) but has (optimally) an additional attraction (about 23.3 kJ mol^-1 [168]. This is the energy (ΔH) required for breaking the bond and completely separating the atoms. It should equal about half the enthalpy of vaporization. On the same basis ΔS = 37 J deg^-1 mol^-1 [168]. (Lower enthalpies for the hydrogen bond have been reported [1369], varying between ≈ 6-23 kJ ˣ mol^-1, with entropies ≈ 29-46 J deg^-1 mol^-1, depending on the assumptions made). Just breaking the hydrogen bond in liquid water, leaving the molecules essentially in the same position, requires only about 25% of this energy.THANK you very much ,hope this will help you.good luck

@ AHE-ve means loss of Energy Sexothermic By System to Surroundings 1 Reaction ! Ans-c UUU (6) Explain Bond diss Enthalpy 9 ally from 436 kJ/mol H2 / 498 kJ/mol a data H-1 = 0=0= nool non 2 -0 - 49X2 = 99 AKJ/mol H₂O = 10 formation of H2O 2 H249) + 02 (9) 2120 (1) 2x436 + 490 2 x 994 = 872 +498 1988 kJ = 1370 KI ԻՐ ԸՐ Ր Ր Ո Ր Ր Ո Ր INFER And Less Energy is needed to break attractive force Beturen water molecules than to break un and o- Bonds and form 4-0 Bones. Strond - Bond H2o-u-–-o-n & wear Bond