8. Thermochemistry

Enthalpy of Formation

Scelta multipla
In the context of enthalpy of formation, what does it mean when the enthalpy change (ΔH) for a reaction is negative?
150
views
Domanda aperta
How much energy is required to decompose 765 g of PCl₃
1379
views
Scelta multipla
Use standard enthalpies of formation to calculate ΔH⁰_rxn for the following reaction: C(s) + H₂O(g) → CO(g) + H₂(g). Which of the following is the correct value for ΔH⁰_rxn?
833
views
Scelta multipla
Which of the following reactions represents the standard enthalpy of formation (ΔHₒƒ) for CsHSO4(s)?
855
views
Scelta multipla
Use standard enthalpies of formation to calculate ΔH°_rxn for the following reaction: C(s) + H₂O(g) → CO(g) + H₂(g). Given the standard enthalpies of formation: ΔH°_f [C(s)] = 0 kJ/mol, ΔH°_f [H₂O(g)] = -241.8 kJ/mol, ΔH°_f [CO(g)] = -110.5 kJ/mol, ΔH°_f [H₂(g)] = 0 kJ/mol.
911
views
Scelta multipla
Consider the following equation:
2 ClF₃(g) + 2 NH₃(g) → 1 N₂(g) + 6 HF (g) + 6 Cl₂(g) ΔH_rxn = –1196 kJ
Determine the standard enthalpy of formation for chlorine trifluoride, ClF₃.
5480
views
5
rank
3
comments
Domanda aperta
Which answer best describes the transfer of heat that occurs when 1.20 mol of H₂ reacts?
947
views
Scelta multipla
Given the reaction Pb (s) + CO2 (g) → PbO (s) + CO (g) with ΔH° = +131.4 kJ, and the standard enthalpies of formation ΔHf° of CO2(g) = -393.5 kJ/mol and CO(g) = -110.5 kJ/mol, what is the standard enthalpy of formation for PbO(s)?
841
views
Scelta multipla
Using standard thermodynamic data, calculate ΔH°_rxn for the following:
2 C₂H₂ (g) + 5 O₂ (g) → 4 CO₂ (g) + 2 H₂O (l)
1462
views
Scelta multipla
A 0.1326 g sample of magnesium was burned in an oxygen bomb calorimeter. The total heat capacity of the calorimeter plus water was 5,760 J/°C. If the temperature rise of the calorimeter with water was 0.570°C, calculate the enthalpy of combustion of magnesium in kJ/mol.
851
views
Scelta multipla
For which of the following reactions is the enthalpy change for the reaction equal to the standard enthalpy of formation (ΔHf°) of the product?
771
views
Domanda aperta
Which answer best describes the transfer of heat that occurs when 1.30 mol of H₂ reacts?
969
views
Domanda aperta
For which one of the following reactions is δh°rxn equal to the heat of formation of the product?
1340
views
Scelta multipla
Use standard enthalpies of formation to calculate ΔHᵣₓₙ for the following reaction: CH₄(g) + 2O₂(g) → CO₂(g) + 2H₂O(g). Given the standard enthalpies of formation: CH₄(g) = -74.8 kJ/mol, O₂(g) = 0 kJ/mol, CO₂(g) = -393.5 kJ/mol, H₂O(g) = -241.8 kJ/mol.
691
views
Scelta multipla
Given the reaction 2H2 (g) + O2 (g) → 2H2O (l), which of the following is the standard enthalpy change of formation (ΔH_f) for water (H2O) in its liquid state?
946
views