5. Determine the standard heat of formation for methyl bromide, CH3Br(g), given the following equation: CH3Br(g) + H₂(g) ---> CH4(g) + HBr(g) AH° = -73.60 kJ

1. Given the following thermochemical data at 25°C and 1 atm pressure, 3 202(g) + 2B(s) → B203(s) AH° =-1264 kJ O3(g) + 2B(s) → B2O3(s) AH° = -1406 kJ determine AH° for the following reaction at 25°C and 1 atm pressure. 203(g) → 302(g)

Use the standard reaction enthalpies given below to determine AH°rxn for the following reaction: Given: S(s) + 3/2 O2(g) → SO3(g) SO ₂(g) →S(s) + O₂(g) 2 SO2(g) + O2(g) → 2 SO3(g) AHᵒrn = ? AHᵒrn = +297 kJ AH rxn-198 kJ

For the reactionCO(g) + Cl2(g)  COCl2(g)G° = -62.9 kJ and S° = -137.3 J/K at 331 K and 1 atm.This reaction is (reactant, product) fill in the blank 1 favored under standard conditions at 331 K.The standard enthalpy change for the reaction of 2.37 moles of CO(g) at this temperature would be                     kJ.

When a 7.41-g sample of solid potassium chlorate dissolves in 59.3 g of water in a coffee-cup calorimeter (see above figure) the temperature falls from 22.00 oC to 12.96 oC. Calculate H in kJ/mol KClO3 for the solution process. KClO3(s)  K+(aq) + ClO3-(aq)   The specific heat of water is 4.18 J/g-K.Hsolution = _________ kJ/mol KClO3.

18. Calculate the heat of reaction at constant volume for 5.00 g C3H8 ,considering the following chemical reaction: C3H8 (g) + O2(g) --------------------> CO2 (g) + H2O (g) heat of standard formation:  O2 = 0.00  kJ / mole,  H2O (g) = -245 kJ / mole,   CO2 = -318 kJ/mole  and  C3H8  = -438 kJ / mole C3H8 = 44.09 g/mole  Temperature is 33 oC a. -789 kJ b. -212 kJ c. 412 kJ d. -169 kJ

What happens when fuel is added (like a carbon source)? Find the heat of the reaction for the following reaction. Compound AH; (kJ mol¯) N20 81.6 2 N20(g) + C(s) → 2 N2(g) + CO2(g) CO2 -393.51

Gasoline is composed primarily of hydrocarbons, includingmany with eight carbon atoms, called octanes. One ofthe cleanest–burning octanes is a compound called 2,3,4-trimethylpentane, which has the following structural formula: The complete combustion of one mole of this compoundto CO21g2 and H2O1g2 leads to ΔH° = -5064.9 kJ.(a) Write a balanced equation for the combustion of1 mol of C8H181l2. (b) By using the information inthis problem and data in Table 5.3, calculate ΔHf° for2,3,4-trimethylpentane.

The reusable booster rockets of the space shuttle use a mixture of aluminum and ammonium perchlorate as fuel. A possible reaction is 3A1(s) + 3NH, Cl0,(8) → Al, O, (s) + AICI; (s) + 3NO(9) + 6H2O(g) Calculate AH° for this reaction. Substance and State AH ° (kJ/mol) Al(s) Al2 O3 (s) AICI3 (s) H2O(g) NO(g) NH, CIO4 (s) -1676 -704 -242 90. -295 AH° = kJ