How many of the following processes have a AS > 0? . СНЗОН() — СH3ОH(S) N2(g) + 3 H2(g) → 2 NH3(g) • CH4(g) + H20(g) → CO(g) + 3 H2(g) • Na2CO3(s) + H2O(g) + CO2(g) → 2 NaHCO3(s) • KBRO3(s) →K+(aq) + BrO3"(aq) • 2NH4NO3(s) → 2N2(g) + O2(g) + 4H2O(g)

Given the heat of formation of the following compounds:                 CO2(g)                ΔfH° = -393.5 kJ/mol                 H2O(l)                 ΔfH° = -285.9 kJ/mol                 CH3OH(l)          ΔfH° = -238.6 kJ/mol   What is the value of ΔrH° for the reaction:                 CH3OH(l) + 3/2 O2(g) → CO2(g) + 2 H2O(l)

Compound ∆Hf (kJ/mole) ∆S (J/mole K) C2H4 52.4 219.3 C2H6 –84.68 229.2 SiO2 –910.7 41.5   HF –273.3 173.8 SiF4 –1615.0 282.8 NH3 –45.9 192.9 O2 1.88 2.43 NO 91.3 210.8 H2O(g) –241.8 188.8 For the following reactions, using the provided ∆H and ∆S data, determine whether each one would be spontaneous or nonspontaneous at 25°C. C2H4(g) + H2(g) --------à                                  C2H6(g)                 SiO2 + 4 HF(g) ------------->             SiF4 (g) + 2 H2O(g)               4 NH3(g)  +  5 O (g)  ---------> 4 NO(g) + 6 H2O(g)

calculate (d) the molar enthalpy of combustion (AHcomb; in kJ/mol) of benzoic acid. I just need to understand how to calculate part d) the molar enthalpy of benzoic acid.

PLEASE JUST EXPLAIN B NO NEED TO DO A  H3BO3 (aq) → HBO2 (aq) + H2O (l)              ΔH1 = - 0.02 kJ/mol  H2B4O7 (aq) + H2O (l) → 4HBO2 (aq)           ΔH2 = - 11.3 kJ/mol  H2B4O7 (aq) → 2B2O3 (s) + H2O (l)              ΔH3 = 17.5 kJ/mol    a)Find the ΔH for this overall reaction: 2H3BO3 (aq) → B2O3 (s) + 3H2O (l)   b)If 545 J of heat are absorbed or released from the reaction of 330. mL of H3BO3solution, what was the molarity of the solution?

Using bond energies from the table, estimate ΔH for the reaction below. The OH group on the product side is attached to a carbon.CH2=CH2(g) + H2O(g) ↔ CH3CH2OH(g) Bond Energies, kJ/mol Single Bonds   H C N O S F Cl Br I H 432                 C 411 346               N 386 305 167             O 459 358 201 142           S 363 272 --- --- 286         F 565 485 283 190 284 155       Cl 428 327 313 218 255 249 240     Br 362 285 243 201 217 249 216 190   I 295 213 --- 201 --- 278 208 175 149 Multiple Bonds C=C 602 C=N 615 C=O 799 CºC 835 CºN 887 CºO 1072 N=N 418 N=O 607 S=O (in SO2) 532 NºN 942 O2 494 S=O (in SO3) 469

Calculate ΔHf (CH3CH2OH) using the following information ΔHc (C) = -393 kJ mol-1 ΔHc(H2) = -286 kJ mol-1 ΔHc (CH3CH2OH) = -1368 kJ mol-1