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What does pressure-volume work mean? Why...

What does pressure-volume work mean? Why is it considered that work done by a system is negative but work done on the system is positive?

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CHHAYA PUBLICATION-CHEMICAL THERMODYNAMICS-SHORT TYPE QUESTIONS
  1. Show that both heat and work are path dependent quantities.

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  2. Why does the internal enegy of a system increases with rise in tempera...

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  3. What does pressure-volume work mean? Why is it considered that work do...

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  4. Show that for an ideal gas the difference between the molar heat capac...

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  5. In case of a solid or a liquid substance C(P,m)~~C(V,m), but in case o...

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  6. For liquid ethanol at 25^(@)C,DeltaH(f)^(0)=-277.69kJ*mol^(-1). Repres...

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  7. Reaction enthalpy for an exothermic reaction is negative- why?

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  8. For which of the following reactions does the standard enthalpy of rea...

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  9. Given: C(graphite, s)+O(2)(g)toCO(2)(g),DeltaH^(0)=x(1) C(graphite, ...

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  10. At 25^(@)C,DeltaH(f)^(0)=0 for graphite, but for diamond DeltaH(f)^(0)...

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  11. Mention two applications of Hess's law.

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  12. "At 25^(@)C, the standard heat of combustion of graphite is -94300cal*...

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  13. "At 25^(@)C, the standard heat of formation of H(2)O(l) is -285.83kJ*m...

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  14. (1)/(2)A(2)(g)+(1)/(2)B(2)(g)toAB(g),DeltaH=-50kcal. If the bond energ...

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  15. C(s)+(1)/(2)O(2)(g)toCO(g),DeltaH=-110.4kJ. Does this DeltaH represent...

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  16. Give two examples of spontaneous process.

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  17. When an adiabatic process is said to be an isoentropic process ?

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  18. An exothermic reaction associated with decrease in entropy takes place...

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  19. What are the conditions of spontaneity and equilibrium for a process i...

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  20. Cl(g)+Cl(g) toCl(2)(g). What will be the sign of DeltaH and DeltaS in ...

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