part 14,15,16,17 Given the following standard enthalpy change, use the standard

Question

part 14,15,16,17 Given the following standard enthalpy change, use the standard enthalpies of formation in Table 5.3 to calculate the standard enthalpy of formation of CuO(s). CuO(s) + H_2(g) rightarrow Cu(s) + H_2O(l) Delta H degree = -129.7 kJ Explain the difference between thermal energy, heat and temperature. Why is an electrical power plant impossible without some form of energy input, be it a coal-fired plant, a gas-fired plant or a nuclear powered plant? What is a state function? Give an example of a state function

Explanation / Answer

14.

For the reaction,

-129.7 = (dHf(Cu(s)) + dHf(H2O(l))) - (dHf(CuO(s)) + dHf(H2(g)))

-129.7 = (-285.8) - dHf(CuO(s))

Thus,

standard enthalpy of formation for CuO(s) would be,

dHf[CuO(s)] = -156.1 kJ/mol

15. Thermal energy as the term suggests is internal energy of a system. The heat is defined as the change is thermal energy within a system due to movement. As the heat is transferred from one center to another a tempertature change or gradient is formed within the system.

16. Thermal power plants require some form of energy input as the energy generated by burning the feed is used to generate steam which is in turn used to produce electricity. thus without any initial source of energy steam cannot be produced and thus impossible to get electricity.

17. State functions are propeties which depend only on the state that is end point and not on the path which is taken to achieve that state. Example of a state fucntion is say enthalpy.

Related Questions

Navigate

• Browse (All)
• Browse P
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.