For a particular isomer of C8H18, the combustion reaction produces 5093.7 kJ of heat per mole of C8H18(g) consumed, under standard conditions.   C8H18(g)+252O2(g)⟶8CO2(g)+9H2O(g)Δ?∘rxn=−5093.7 kJ/mol   What is the standard enthalpy of formation of this isomer of C8H18(g)?

Determine the enthalpy of reaction (DHxn) in kJ/ mol H20 formed if an acid/base neutralization if 13.6 mL of 1.205 M NaOH is reacted with 25.0 mL of 1.108 M HCI causing an increase in the calorimeter temperature of 6.85 °C. Use 3.93 J/g°C for the specific heat capacity of the final solution and the density for the final solution is 1.02 g/mL.

For a particular isomer of Cg H₁g, the combustion reaction produces 5108.7 kJ of heat per mole of C, H₁g (g) consumed, under standard conditions. 25 Cg H18 (8) + O₂(g) →→→ 8 CO₂(g) + 9 H₂O(g) What is the standard enthalpy of formation of this isomer of Cg H₁g (g)? AH; = $ V T B MacBook Air Y H & 7 8 AH-5108.7 kJ/mol 18 N M K 1 38 kJ/mol

2. Slaked lime (Ca(OH)2(s)) is produced when lime (calcium oxide, Cao (s)) reacts with liquid water. 65.2 kJ of heat is released for each mol of Ca(OH)2 that is produced. (a) Write a thermochemical equation for the reaction. (b) What is the enthalpy change when 523.3 kg of lime reacts with excess water?

The combustion of propanal (C3H6O; 58.079 g/mol) is studied in a bomb calorime an experiment in which the volume does not change. The heat of combustion as measured in this calorimetry experiment is found to be -26.20 kJ/g of propanal at 298 K. What is the molar enthalpy of combustion for this reaction? C3H6O(l) + 4 O₂(g) → 3 CO₂(g) + 3 H₂O(l) -> -1519.2 kJ/mol -1524.1 kJ/mol -1521.7 kJ/mol O-26.20 kJ/mol -1525.4 kJ/mol -1526.7 kJ/mol

You mix 125 mL of 0.250 M CSOH with 50.0 mL of 0.625 M HF in a coffee-cup calorimeter, and the temperature of both solutions rises from 21.70 °C before mixing to 24.59 °C after the reaction. CsOH(aq) + HF (aq) → CsF(aq) + H₂O(l) What is the enthalpy of reaction per mole of CSOH? Assume the densities of the solutions are all 1.00 g/mL, and the specific heat capacities of the solutions are 4.2 J/g. K. Enthalpy of reaction = kJ/mol

The flame in a torch used to cut metal is produced by burning acetylene (C2H2)(26.04 g/mol) in pure oxygen. Assuming the combustion of 1 mole of acetylene releases 1251 kJ of heat, what mass of acetylene is needed to cut through a piece of steel if the process requires 22.5  × 104 kJ of heat?                                            2 C2H2(g) + 5 O2(g) → 4 CO2(g) + 2 H2O(g) ΔH = –2502 kJ

The combustion of 0.1566 g benzoic acid increases the temperature of a bomb calorimeter by 2.51°C. Calculate the heat capacity of this calorimeter. (The energy released by combustion of benzoic acid is 26.42 kJ/g.) Heat capacity = kJ/°C A 0.2195-g sample of vanillin (Cg H3 O3) is then burned in the same calorimeter, and the temperature increases by 3.21°C. What is the energy of combustion per gram of vanillin? Energy = kJ/g Per mole of vanillin? Energy = kJ/mol

The combustion of 0.1556 g benzoic acid increases the temperature of a bomb calorimeter by 2.50°C. Calculate the heat capacity of this calorimeter. (The energy released by combustion of benzoic acid is 26.42 kJ/g.) Heat capacity = kJ/°C 8 A 0.2194-g sample of vanillin (Cg H8O3) is then burned in the same calorimeter, and the temperature increases by 3.20°C. What is the energy of combustion per gram of vanillin? Energy = kJ/g Per mole of vanillin? Energy = kJ/mol

（1）Consider the reaction: 2A (g) + 3 B (g) → 2 C (g)     ΔHrxn = +254.3 kJ What will be the enthalpy change (in kJ) if 0.471 mol B reacts in excess A?   （2）Consider the reaction: C (s) + O2 (g) → CO2 (g)     ΔHrxn = -393.5 kJ What mass of carbon (in g) must be reacted via this mechanism to release 581.2 kJ of heat?