What is the enthalpy of formation of hexane?
167.2 kJ/mol
Thermodynamic properties
| Phase behavior | |
|---|---|
| Std enthalpy change of formation, ΔfHogas | –167.2 kJ/mol |
| Standard molar entropy, Sogas | 388.82 J/(mol K) |
| Heat capacity, cp | 142.6 J/(mol K) at 25 °C |
| van der Waals’ constants | a = 2471 L2 kPa/mol2 b = 0.1735 liter per mole |
How do you calculate the enthalpy change of combustion of hexane?
1.15g of hexane = 0.013mol of hexane. 3) Find enthalpy change of reaction. Combustion of 1mol of hexane produces (by my calculations) -4194 kJ/mol. Therefore, 0.013mol will produce (0.013/-4194) -3.1×10-6 kJ/mol.
What is the molar enthalpy of hexane?
The molar enthalpy of hexane (C6H14) is 28.9 kJ/mol, and its normal boiling point is 68.73 °C.
What is the enthalpy of formation of H2?
For H2 enthalpy of formation is zero, because it already is the most elementary form. In the problem, however, it’s talking about hear of combustion, which is different — Hydrogen does release heat.
What is the enthalpy change of the reaction C6H14 C2H4?
C6H14 (l) → C2H4 (g) + C4H10 (g) Enthalpy of combustion: C6H14 (l) = -4163 C2H4 (g) = -1411 C4H10 (g) = -2878.
What does the expression +78.3 kJ signify?
What does the expression + 78.3 kj signify? An exothermic reaction that releases 78.3 kj of heat per mole of reactant A.
What is the enthalpy change of reaction in butane?
On your diagram label the enthalpy change of reaction, DH, and the activation energy, Ea. [Total 3 marks] 2. The combustion of butane is shown in the equation below. C4H10(g) + 6 O2(g) ® 4CO2(g) + 5H2O(l) (i) The standard enthalpy change of combustion of butane is –2877 kJ mol–1.
What is the definition of enthalpy change of formation?
Recall the definition of enthalpy change of formation. “The enthalpy change of a reaction where one mole of a substance is formed from its elements, where everything is in their standard states”. So one mole of iron oxide is formed from its elements in its standard states.
How to calculate enthalpy of combustion of ethene?
C3H8(g) ® C2H4(g) + CH4(g) The standard enthalpy change of combustion of ethene, DHcq = –1410 kJ mol-1. Use this value together with relevant values in Table above to calculate the enthalpy change of this reaction.
What is the enthalpy change when 1 mole of HCl reacts?
The enthalpy change when 1 mole of HCl reacts is −58 kJ. Since that is the number of moles in the chemical equation, we write the thermochemical equation as: HCl(aq) + NaOH(aq) ⟶ NaCl(aq) + H2O(l) ΔH = − 58kJ