Choose the correct statement.
Correct answer: A. The thermodynamics first law is not sufficient to predict the direction of the process
- A. The thermodynamics first law is not sufficient to predict the direction of the process
- B. In the case of an exothermic reaction, the overall enthalpy fo the products is greater than that of reactants
- C. for the reaction H2(g) + Br2 (l) → 2HBr (g) from the bond enthaly data, It is possible to calculate the value of H
- D. At 298K and 1 atmpressure, diamond's standard enthalpy is zero
Explanation
Only option A has correct statement. The first law of thermodynamics states that energy is conserved in any process. It does not provide information about the direction of a process or whether the process will occur spontaneously.
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About First Law of Thermodynamics
The first law states that energy is conserved, so the change in a system's internal energy equals heat supplied plus work done on the system, ΔU = q + w. Questions use sign conventions, expansion and compression work, state functions versus path functions, and the relation between internal energy and enthalpy.
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