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Question
Thermodynamics is not concerned about ______.
Options
Energy changes involved in a chemical reaction.
The extent to which a chemical reaction proceeds.
The rate at which a reaction proceeds.
The feasibility of a chemical reaction
Solution
Thermodynamics is not concerned about the rate at which a reaction proceeds.
Explanation:
Thermodynamics is not concerned about how and at what rate these energy transformations are carried out but is based on initial and final states of a system undergoing the change. Laws of thermodynamics apply only when a system is in equilibrium or moves from one equilibrium state to another equilibrium state.
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RELATED QUESTIONS
Thermodynamics mainly deals with:
(i) interrelation of various forms of energy and their transformation from one form to another.
(ii) energy changes in the processes which depend only on initial and final states of the microscopic systems containing a few molecules.
(iii) how and at what rate these energy transformations are carried out.
(iv) the system in equilibrium state or moving from one equilibrium state to another equilibrium state.
Consider the following reaction between zinc and oxygen and choose the correct options out of the options given below:
\[\ce{2 Zn (s) + O2 (g) -> 2 ZnO (s); ∆H = - 693.8 kJ mol^{-1}}\]
(i) The enthalpy of two moles of \[\ce{ZnO}\] is less than the total enthalpy of two moles of \[\ce{Zn}\] and one mole of oxygen by 693.8 kJ.
(ii) The enthalpy of two moles of \[\ce{ZnO}\] is more than the total enthalpy of two moles of \[\ce{Zn}\] and one mole of oxygen by 693.8 kJ.
(iii) 693.8 kJ mol–1 energy is evolved in the reaction.
(iv) 693.8 kJ mol–1 energy is absorbed in the reaction.
The internal energy (in J) when 90 g of water undergoes complete evaporation at 100°C is ______.
(Given ΔHvap for water at 373 K = 41 kJ/mol, R = 8.314 JK−1 mol−1)
Which one of the following equations does not correctly represent the first law of thermodynamics for the given processes involving an ideal gas? (Assume non-expansion work is zero)
