Once it is in the vapor phase, the methanol can react with oxygen in the air according to CH3OH(g) + O2(g) → CO2(g) + 2 H2O(g) Use average bond enthalpies to estimate the enthalpy change in this reac- tion, for 1 mol of methanol reacting.

Calculating the heat of reaction from molar reaction enthalpy a... A chemist measures the energy change AH during the following reaction: 2 Fe,03(s) → 4 FeO(s)+O2(g) AH=560. kJ Use the information to answer the following questions. endothermic. This reaction is... Ix10 exothermic. Suppose 93.3 g of Fe,O, react. Yes, absorbed. Yes, released. Will any heat be released or absorbed? No. If you said heat will be released or absorbed in the second part of this question, calculate how much heat will be released or absorbed. Round your answer to 3 significant digits.

A student runs two experiments with a constant-volume "bomb" calorimeter containing 1500.g of water (see sketch at right). First, a 5.500g tablet of benzoic acid C6H5CO2H is put into the "bomb" and burned completely in an excess of oxygen. (Benzoic acid is known to have a heat of combustion of 26.454kJ/g.) The temperature of the water is observed to rise from 17.00°C to 39.05°C over a time of 8.9 minutes. Next,4.580g of acetaldehyde C2H4O are put into the "bomb" and similarly completely burned in an excess of oxygen. This time the temperature of the water rises from 17.00°C to 35.79°C.   2C2H4Og + 5O2g -> 4CO2g + 4H2Og Be sure any of your answers that are calculated from measured data are rounded to the correct number of significant digits. Is this reaction exothermic, endothermic, or neither? If you said the reaction was exothermic or endothermic, calculate the amount of heat that was released or absorbed by the reaction in the second experiment. Calculate the reaction…

Use the molar bond enthalpy data in the table to estimate the value of Δ?∘rxnΔHrxn° for the equation C2H4 (g) + HBr (g) --> C2H5Br (g)  Average molar bond enthalpies. (?bond)(Hbond) Bond ??⋅???−1kJ⋅mol−1 Bond ??⋅???−1kJ⋅mol−1 O−HO−H 464464 C≡NC≡N 890890 O−OO−O 142142 N−HN−H 390390 C−OC−O 351351 N−NN−N 159159 O=OO=O 502502 N=NN=N 418418 C=OC=O 730730 N≡NN≡N 945945 C−CC−C 347347 F−FF−F 155155 C=CC=C 615615 Cl−ClCl−Cl 243243 C≡CC≡C 811811 Br−BrBr−Br 192192 C−HC−H 414414 H−HH−H 435435 C−FC−F 439439 H−FH−F 565565 C−ClC−Cl 331331 H−ClH−Cl 431431 C−BrC−Br 276276 H−BrH−Br 368368 C−NC−N 293293 H−SH−S 364364 C=NC=N 615615 S−SS−S 225225