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Given the following entropy values (in J...

Given the following entropy values (in `JK^(-1)"mol"^(-1))` at 298 K atm : `H_(2)(g):130.6.Cl_(2)(g):223.0andHCl(g): 186.7` . The entropy change (in `JK^(-1)"mol"^(-1))` for the reaction
`H_(2)(g)toCl_(2)(g)to2HCl(g)`is

A

540.3

B

727

C

`-166.9`

D

19.8

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Calculate the standard molar entropy change for the formation of gaseous propane (C_(3)H_(8)) at 293K . 3C("graphite") +4H_(2)(g) rarr C_(3)H_(8)(g) Standard molar entropies S_(m)^(Theta) (JK^(-1)mol^(-1)) are: C("graphite") = 5.7, H_(2)(g) = 130.7,C_(3)H_(5)(g) = 270.2

The standard heats of formation at 298K for C Cl_(4)(g),H_(2)O(g),CO_(2)(g) and HCl(g) are -25.5,-57.8,-94.1 and -22.1 kcal mol^(-1) respectively. Calculate DeltaH_(298)^(@) for the reaction. C Cl_(4)(g)+2H_(2)O(g)toCO_(2)(g)+4HCl(g) .

Knowledge Check

  • Given the following entropy values ( in JK^(-1) "mol"^(-1) ) at 298 K and 1 atm: H_(2)(g):130.6, Cl_(2)(g):223.0, HCl(g): 186.7 . The entropy change (in JK^(-1) "mol"^(-1) ) for the reaction H_(2)(g) + Cl_(2)(g) to 2HCl(g) , is

    A
    `+540.3`
    B
    `+727.0`
    C
    `-166.9`
    D
    `+19.8`

  • Given the followng entropy values (in JK^(-1)"mol"^(-1) ) at 298 K and 1 atm H_(2)(g),130.6, Cl_(2)(g),223.0HCl(g), 186.7 . The entropy change (in JK^(-1)"mol"^(-1) ) for the reaction H_(2)(g)+Cl_(2)(g)to2HCl(g) is

    A
    `+540.3`
    B
    `+727.0`
    C
    `-166.9`
    D
    `+19.8`

  • Given the following entropy vlaues (in JK^(-1)mol^(-1) ) at 298 K ad 1 atm: H_(2)(g):130.6 , HCl(g):186.7 , Cl_(2)(g):223.0 , Cl_(2)(g)to2HCl(g) is

    A
    `+540.3`
    B
    `727.0`
    C
    `-166.9`
    D
    19.8

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    The entropy values (in JK^(-1) mol^(-1) ) of H_(2(g)) = 130.6, Cl_(2(g))=223.0 and HCl_((g))=186.7 at 298 K and 1 atm pressure. Then entropy change for the reaction H_(2(g))+Cl_(2(g))rarr2HCl_((g)) is

    The heat of formation of the compound in the following reaction is H_(2)(g)+Cl_(2)(g)to2HCl(g)+44kcal

    Enthalpy change for reaction 1//2H_(2)(g)+1//2Cl_(2)(g)toHCl(g) is called :-

    From the following data at 25^(@) C {:("Reaction" ,, Delta_(r) H^(@) kJ//mol) , ((1)/(2) H_(2) (g) + (1)/(2) O_(2) (g) to OH (g) ,, 42), (H_(2) (g) + (1)/(2) O_(2) (g) to H_(2) O (g) ,, -242), (H_(2) (g) to 2 H (g) ,, 436) , (O_(2) (g) to 2 O(g) ,, 495):} Which of the following statement(s) is/are correct : Statement(a) : Delta_(r) H^(@) for the reaction H_(2) O (g) to 2 H(g) + O(g) is 925 kJ/mol Statement (b) : Delta_(r) H^(@) for the reaction OH(g) to H_(2) (g) + O(g) is 502 kJ/mol Statement(c) : Enthalpy of formation of H(g) is – 218 kJ/mol Statement(d) : Enthalpy of formation of OH(g) is 42 kJ/mol

    From the following data at 25^(@)C {:(Reaction ,Delta_(r)H^(o)kJ//mol),((1)/(2)H_(2)(g)+(1)/(2)O_(2)(g)toOH(g),42),(H_(2)(g)+(1)/(2)O_(2)(g)to H_(2)O(g),-242),(H_(2)(g)to 2H(g),436),(O_(2)(g)to2O(g),495):} Which of the following Statement (s) is /are Correct: StatementA: Delta_(r)H^(@) "for the reaction" H_(2)O(g)to2H(g)+O(g)"is 925.5kJ/mol" Statement B: Delta_(r)H^(@) "for the reaction" H_(2)O(g)toH(g)+O(g)"is 423.5kJ/mol" Statement C:Enthalpy of formation of H(g) is-218 kJ/mol Statement D: Enthalpy of formation of OH(g) is 42 kJ/mol

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