First law, enthalpy, entropy, Gibbs free energy, spontaneity.
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Q1 · Thermodynamics (Chemical) · EASY
For an exothermic reaction, the change in enthalpy (ΔH) is:
Q2 · Thermodynamics (Chemical) · MEDIUM
For the reactions A → B (ΔH = +50 kJ) and B → C (ΔH = −80 kJ), the enthalpy change for A → C is:
Q3 · Thermodynamics (Chemical) · MEDIUM
A reaction is spontaneous at all temperatures if:
Q4 · Thermodynamics (Chemical) · MEDIUM
A process has ΔH = -20 kJ and ΔS = -50 J/K at 300 K. What is the Gibbs free energy change (ΔG) for this process?
Q5 · Thermodynamics (Chemical) · EASY
For a reaction at equilibrium at constant temperature and pressure, the value of Gibbs free energy change (ΔG) is: