8. Thermochemistry

Enthalpy of Formation

객관식
When 2.275 g of anthracene, C14H10, is combusted in a bomb calorimeter with a water jacket containing 500.0 g of water, the temperature of the water increases by 43.15°C. Assuming the specific heat of water is 4.18 J/(g°C), and that the calorimeter absorbs no heat, what is the enthalpy change (ΔH) for the combustion of anthracene in kJ/mol?
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객관식
Find ΔH_rxn for the following reaction:
N₂ + 2 O₂ → 2 NO₂
Based on the following data.
2 NO → N₂ + O₂ ΔH = −180 kJ
2 NO + O₂ → 2 NO₂ ΔH = −112 kJ
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객관식
What is the total change in enthalpy when 25.0 g of solid ethanol (C2H5OH) at -125 °C is converted to liquid ethanol at -80 °C? The table below provides physical and thermochemical data for ethanol. Normal melting point: -114 °C. Assume the specific heat capacities and enthalpy of fusion are known.
781
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미해결 질문
Which answer best describes the transfer of heat that occurs when 1.70 mol of H₂ reacts?
881
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객관식
The enthalpy for the formation of 1 mole of NH₃(aq) is -80.29 kJ/mol. What is the enthalpy for the formation of 3 moles of NH₃(aq)?
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미해결 질문
The enthalpy of the reaction is –2,840 kJ. What is the heat of combustion, per mole, of glucose?
1027
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미해결 질문
What is the heat of combustion of ethane, C₂H₆, in kilojoules per mole of ethane? Enthalpy of formation values can be found in this list of thermodynamic properties.
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객관식
Given the heat of formation of TiI3(s) is -328 kJ/mol and the heat of reaction for 2Ti(s) + 3I2(g) → 2TiI3(s) is -839 kJ, what is the heat of sublimation of I2(s) at 25°C?
934
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객관식
Consider the combination reaction: 2Mg(s) + O2(g) → 2MgO(s) with ΔH = -1204 kJ. What is the enthalpy change for the decomposition of 1 mole of MgO(s) into Mg(s) and O2(g)?
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객관식
Given the reaction 2C6H6(l) + 15O2(g) → 12CO2(g) + 6H2O(l), what is the standard enthalpy change (ΔH°) of this reaction in kJ?
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객관식
Which of the following statements is true regarding the enthalpy change of a reaction when the quantities of reactants are doubled?
763
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미해결 질문
4 NH₃(g) + 5 O₂(g) → 4 NO(g) + 6 H₂O(g)
1130
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객관식
What is the standard enthalpy change of formation for NaCl(aq) at 25°C?
1061
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객관식
Use standard enthalpies of formation to calculate ΔH°_rxn for the following reaction: CaO(s) + CO2(g) → CaCO3(s). Which of the following is the correct ΔH°_rxn value?
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