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Enthalpy of reaction

Chemistry • Enthalpy • Knowledge-Based • 5 questions

Enthalpy of reaction Knowledge-Based Download PDF

Chemistry · Thermochemistry & Thermodynamics · Chemistry · Enthalpy

5 Chemistry practice questions on Enthalpy of reaction. Questions that assess core concepts and understanding.

Questions

  1. 1.

    When 50.0 mL of 1.00 M HCl is mixed with 50.0 mL of 1.00 M NaOH in a coffee-cup calorimeter, both initially at 22.0 °C, the temperature of the mixture rises to 28.7 °C. Assuming the combined solution has a density of 1.00 g/mL and a specific heat capacity of 4.18 J/(g·°C), what is the molar enthalpy of neutralization for this reaction?

    • A) -56.0 kJ/mol
    • B) +56.0 kJ/mol
    • C) -28.0 kJ/mol
    • D) -112 kJ/mol
  2. 2.

    Using the average bond energies of 436 kJ/mol436\text{ kJ/mol} for H−H\text{H}-\text{H}, 242 kJ/mol242\text{ kJ/mol} for Cl−Cl\text{Cl}-\text{Cl}, and 431 kJ/mol431\text{ kJ/mol} for H−Cl\text{H}-\text{Cl}, what is the estimated enthalpy of reaction for H2(g)+Cl2(g)→2HCl(g)\text{H}_2(g) + \text{Cl}_2(g) \rightarrow 2\text{HCl}(g)?

    • A) +184 kJ
    • B) -184 kJ
    • C) -92 kJ
    • D) +247 kJ
  3. 3.

    Given the thermochemical equations C(s)+O2(g)→CO2(g)\text{C}(s) + \text{O}_2(g) \rightarrow \text{CO}_2(g) with ΔH∘=−393.5 kJ\Delta H^\circ = -393.5\text{ kJ} and 2CO(g)+O2(g)→2CO2(g)2\text{CO}(g) + \text{O}_2(g) \rightarrow 2\text{CO}_2(g) with ΔH∘=−566.0 kJ\Delta H^\circ = -566.0\text{ kJ}, what is the standard enthalpy of reaction for C(s)+12O2(g)→CO(g)\text{C}(s) + \frac{1}{2}\text{O}_2(g) \rightarrow \text{CO}(g)?

    • A) −676.5 kJ-676.5\text{ kJ}
    • B) +110.5 kJ+110.5\text{ kJ}
    • C) −110.5 kJ-110.5\text{ kJ}
    • D) −172.5 kJ-172.5\text{ kJ}
  4. 4.

    Given the thermochemical equation 2SO2(g)+O2(g)→2SO3(g)2\text{SO}_2(g) + \text{O}_2(g) \rightarrow 2\text{SO}_3(g) with ΔH∘=−198 kJ\Delta H^\circ = -198\text{ kJ}, what is the enthalpy change when 32.0 g of SO2\text{SO}_2 reacts completely with excess oxygen? (Molar mass of SO2\text{SO}_2 is 64.0 g/mol)

    • A) +49.5 kJ
    • B) -49.5 kJ
    • C) -99.0 kJ
    • D) +99.0 kJ
  5. 5.

    Given the standard enthalpies of formation ΔHf∘\Delta H_{\text{f}}^\circ for CO2(g)\text{CO}_2(g) is -393.5 kJ/mol, for H2O(l)\text{H}_2\text{O}(l) is -285.8 kJ/mol, and for C2H6(g)\text{C}_2\text{H}_6(g) is -84.7 kJ/mol, what is the standard enthalpy of combustion for one mole of ethane gas?

    • A) +1559.7 kJ/mol
    • B) -594.6 kJ/mol
    • C) -1559.7 kJ/mol
    • D) -1729.1 kJ/mol