rather than oxygen is the combustion agent. The enthalpy of formation of CF4(g) is kJ/mol. The enthalpy of formation two reactions is the more exothermic? CH4(g) + 2 O2(g) → CO2(g) + 2 H2O(g) CH4(g) + 4 F2(g) CF4(g) + 4 HF(g)

What is the enthalpy change when 4.70 grams of HF(g) (molar mass= 20.0 g/mol) are formed by the following reaction?               H2(g)    +    F2(g)    ⟶    2HF(g)                                     ΔH = -537 kJ

Hess's Law Prelab Questions Name Section 1. A thermometer placed in a solution undergoing a chemical reaction indicates an increase in temperature as the reaction proceeds. Is this reaction endothermic or exothermic? Describe if heat energy is lost or gained from the reaction (the system) to the surroundings. What is the sign of the enthalpy change (AH) of this reaction? of aola) Goules)

5. A 1.500-g sample of a hydrocarbon is placed in a bomb calorimeter and undergoes combustion. The temperature of the calorimeter rises from 20.00°C to 23.55°C. If the calorimeter has a heat capacity of 40.3 J/°C, what is the heat of combustion (qv) for this hydrocarbon in kJ/g? 6. The heat of sublimation for iodine is 62.4 kJ/mol, at 25°C and 1.00 atm. What is AE for the sublimation of iodine (shown below) under these conditions? 2 (s) F 2 (g) volsd 7. A bomb calorimeter with heat capacity of 1.500x103 J/°C was used to study combustion of terbium (Tb) in excess oxygen: 4 Tb (s) + 3 O2 (g) →2 Tb2O3 (s) When 1.000-g of terbium was burned, a temperature increase of 3.908°C was observed. What is the AE for the reaction, in kJ/mol of Tb2O3?