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Mention the standard states of the follo...

Mention the standard states of the following elements at `25^(@)C and 1atm`: carbon, bromine, iodine, sulphur, oxygen, calcium, chlorine, fluorine and nitrogen.

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At `25^(@)C` and 1 atm, standard states of the given element are- (i) Carbon: C(s,graphite), (ii) bromide, `Br_(2)(l),` (iii) Iodine: `I_(2)(s)`, (iv) Sulphur: S(s, rhombic), (v) Oxygen: `O_(2)(g)`, (vI) calcium: Ca(s) (vii) Chlorine: `Cl_(2)(g),` (viii) Fluorine: `F_(2)(g)`, (ix) Nitrogen: `N_(2)(g)`.
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CHHAYA PUBLICATION-CHEMICAL THERMODYNAMICS-WARM UP EXERCISE
  1. What do you mean by the standard state of a substance? Is 25^(@)C the ...

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  2. Why is the concept of standard state necessary? What do you mean by th...

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  3. Mention the standard states of the following elements at 25^(@)C and 1...

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  4. Why is DeltaH=DeltaU for the following two reactions? Explain. (i) N...

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  5. Why does the value of DeltaH for a chemical reaction depend on the phy...

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  6. Give an example of a reaction for each of the following relations betw...

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  7. Give an example of a physical change for each of the following relatio...

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  8. For which element in each of the following pairs has the standard heat...

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  9. In which of the following reactions At 25^(@)C, does the standard enth...

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  10. Which one of the given reactions indicates the formation reaction of t...

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  11. At 25^(@)C the standard heat of formation of liquid benzene is +49.0 k...

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  12. The standard heat of combustion of solid naphthalene [C(10)H(8)(s)] at...

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  13. Give an example of a combustion reaction whose standard enthalpy chang...

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  14. The standard enthalpy of combustion of C(x)H(y)(l) at 25^(@)C is Q kJ*...

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  15. The standard heats of combustion of CH(4)(g) and C(2)H(6)(g) are -890k...

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  16. Define: (i) Enthalpy of fusion, (ii) Enthalpy of vaporisation, (iii) E...

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  17. Identify whether the enthalpy of the initial state is greater than, le...

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  18. At a given temperature and pressure, the enthalpies of condensation an...

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  19. Why are the changes in enthalpies for the given processes the same? (i...

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  20. What does DeltaH signify in each of the following equations? (i) HCl...

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