“If different processes are used to bring about the same chemical reaction, the enthalpy change is same for all of them”. This is ______________ law?

Related Mcqs:

1. Enthalpy of formation of NH3 is – 46 kJ/kg mole. The enthalpy change for the gaseous reaction, 2NH3 → N2 + 3H2, is equal to _____________ kJ/kg. mole?

   A. 46
   B. 92
   C. -23
   D. -92

2. Entropy change of the reaction, H2O (liquid) → H2O (gas), is termed as the enthalpy of___________________?

   A. Solution
   B. Vaporisation
   C. Formation
   D. Sublimation

3. High pressure steam is expanded adiabatically and reversibly through a well insulated turbine, which produces some shaft work. If the enthalpy change and entropy change across the turbine are represented by ΔH and ΔS respectively for this process ?

   A. Δ H = 0 and ΔS = 0
   B. Δ H ≠ 0 and ΔS = 0
   C. Δ H ≠ 0 and ΔS ≠ 0
   D. Δ H = 0 and ΔS ≠ 0

4. Chemical engineering thermodynamics is concerned with the ____________ in/of chemical processes?

   A. Reaction mechanism
   B. Calculation of rates
   C. Energy transformation from one form to another
   D. None of these

5. Chemical potential (an intensive property) of a substance is a force that drives the chemical system to equilibrium and is equal to its partial molar properties. The ratio of chemical potential to free energy of a pure substance at constant temperature and pressure is________________?

   A. 0
   B. 1
   C. ∞
   D. None of these

6. At equilibrium condition, the chemical potential of a material in different phases in contact with each other is equal. The chemical potential for a real gas (μ) is given by (where, μ = standard chemical potential at unit fugacity (f° = 1 atm.) and the gas behaves ideally.) ?

   A. μ° + RT ln f
   B. μ°+ R ln f
   C. μ° + T ln f
   D. μ° + R/T ln f

7. In the reaction, C + O2 → CO2; ΔH = – 94 kcal. What is the heat content (enthalpy) of O2 ?

   A. -94 kcal
   B. > -94 kcal
   C. < – 94 kcal
   D. Zero

8. Pressure-enthalpy chart is useful in refrigeration. The change in internal energy of an ideal fluid used in ideal refrigeration cycle is_____________________?

   A. Positive
   B. Negative
   C. Zero
   D. Infinity

9. The enthalpy change when ammonia gas is dissolved in water is called the heat of___________________?

   A. Solution
   B. Formation
   C. Dilution
   D. Combustion

10. For a constant pressure reversible process, the enthalpy change (ΔH) of the system is___________________?

    A. Cv.dT
    B. Cp.dT
    C. ∫ Cp.dT
    D. ∫ Cv.dT