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At 25^(@)C, Delta G^(0) for the process ...

At `25^(@)C, Delta G^(0)` for the process `H_(2)O_((l)) hArr H_(2) O_((g))` is 8.6kJ. The vapour pressure of water at this temperature, is nearly

A

24 torr

B

285 torr

C

32.17 torr

D

100 torr

Text Solution

Verified by Experts

The correct Answer is:
A
At equilibrium `DeltaG^(@)=-RTlnK_(eq)`
where `K_("eq")=(P_(H_(2)O)//P^(@))" and "P^(@)=1" bar"`
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From the following data at 25^(@)C {:("Reaction",Delta_(r)H^(@) kJ//mol),((1)/(2)H_(2(g)) + (1)/(2)O_(2(g)) rarr OH_((g)),42),(H_(2(g)) + (1)/(2) O_(2(g)) rarr H_(2)O_((g)),-242),(H_(2(g)) rarr 2H_((g)),436),(O_(2(g)) rarr 2O_((g)),495):} which of the following statement(s) is/are correct Statement (a): Delta_(r)H^(@) for the reaction H_(2)O_((g)) rarr 2H_((g)) + O_((g)) is 925.5 kJ/mol Statement (b): Delta_(r) H^(@) for the reaction OH_((g)) rarr H_((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

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Knowledge Check

  • For the following equilibrium, H_(2)O_((l)) harr H_(2)O_((g)) the increase in the pressure causes

    A
    formation of more `H_(2)O_((l))`
    B
    formation of more `H_(2)O_((g))`
    C
    increase in the boiling point of `H_(2)O_((l))`
    D
    decrease in boiling point of `H_(2)O_((l))`

  • H_(2) O(l) hArr H_(2) O_((s)) , Delta H = - q application of pressure on this equilibrium

    A
    causes formation of more ice
    B
    causes fusion of ice
    C
    has no effect
    D
    lower the melting point

  • For the following equilibrium, H_(2) O(l) hArr H_(2) O(g) the increase in the pressure causes

    A
    formation of more `H_(2)`O(I)
    B
    formation of more `H_(2)` O(g)
    C
    increase in the boiling point of `H_(2) `O(l)
    D
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