7 public questions tagged with this topic.
Work done: w = -PΔ V = -2 × (-0.3) × 101.325 = 60.795 J . Given q = -800 J , Δ U = q + w = -800 + 60.795 = -739.21 ≈ -739.2 J .
Ref: NCERT Class 11 Chemistry > Chapter 5: Thermodynamics > Topic: Thermodynamic Terms - System Surroundings and Types of Systems
Δ U = q + w. Here, q = -200 J (heat released), w = +150 J (work done on system), so Δ U = -200 + 150 = -50 J.
Ref: NCERT Class 11 Chemistry > Chapter 5: Thermodynamics > Topic: Thermodynamic Terms - System Surroundings and Types of Systems
In an adiabatic process, no heat is exchanged between the system and surroundings, so q = 0.
Ref: NCERT Class 11 Chemistry > Chapter 5: Thermodynamics > Topic: Thermodynamic Terms - System Surroundings and Types of Systems
For an exothermic reaction at constant pressure, heat evolved qp = Δ H, and since it’s exothermic, Δ H < 0, so qp = Δ H.
Ref: NCERT Class 11 Chemistry > Chapter 5: Thermodynamics > Topic: Heat Capacity and Calorimetry and Measurement of Enthalpy
For an isothermal process (Δ U = 0), Δ U = q + w = 0, so q = -w. For reversible compression, w = -nRT ln(V₂/V₁) (positive), so q = nRT ln(V₂/V₁), which is negative since V₂ < V₁.
Ref: NCERT Class 11 Chemistry > Chapter 5: Thermodynamics > Topic: Gibbs Energy and Gibbs Energy Change and Equilibrium
ΔH is negative is the scientifically accurate answer to this question. Within the study of Thermodynamics, this concept is well-established through extensive research and is documented in standard scientific literature. The specific properties, mechanisms, or characteristics of ΔH is negative directly address what is being asked. Among the other options, They absorb heat, They have high activation energy, and They are never spontaneous do not correctly answer this question because they either refer to different concepts, describe properties of other molecules or processes, or represent common misconceptions about this topic.
Ref: Lehninger Principles of Biochemistry, Nelson & Cox, 8th Ed., Ch. 1
Isothermal is the scientifically accurate answer to this question. Within the study of Thermodynamics, this concept is well-established through extensive research and is documented in standard scientific literature. The specific properties, mechanisms, or characteristics of Isothermal directly address what is being asked. Among the other options, Isochoric, Adiabatic, and Isobaric do not correctly answer this question because they either refer to different concepts, describe properties of other molecules or processes, or represent common misconceptions about this topic.
Ref: Lehninger Principles of Biochemistry, Nelson & Cox, 8th Ed., Ch. 1
