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Enthapy of solution (Delta(Sol) H^(@)) o...

Enthapy of solution `(Delta_(Sol) H^(@))` of a solute is the enthalpy change when one mole of it dissolves in ______of solvent

A

excess

B

an unknown amount

C

a specified amount

D

an infinite amount

Text Solution

Verified by Experts

The correct Answer is:
C
It is also called the integral of solution. The heat of solution (also called the enthalpy of solution), `Delta_("Soln") H^(@)`, is the heat generated or absorbed when one mole of solute dissolves in a specific amount of solvent at 1 bar pressure and specified temperature. The quantity `Delta_("Soln") H^(@)` represents the difference between the enthalpy of the final solution and the enthalpies of its original components (that is, solute and solvent) before they are mixed
`Delta_(Soln) H^(@) = H_(Soln)^(@) - H_("components")`
Neither `H_("Soln")^(@)` nor `H_("components")^(@)` can be measured, but their difference, `Delta_("Soln") H^(@)`, is positive for endothermic (heatabsorbing) process and negative for exothermic (heat-generating) process.
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Knowledge Check

  • When a solute is dissolved in a solvent

    A
    vapoure pressure of the solvent is increased
    B
    freezing point of the solution becomes more than that of solvent
    C
    boiling point of the solution becomes lower thant that of solvent
    D
    vapour pressure of the solvent is decreased

  • 4.0 molar solution is obtained when 1.0 mole solute is dissolved in ______.

    A
    250 mL solution
    B
    250 mL solvent
    C
    250 g solvent
    D
    1000 mL solvent

  • 2.0 molar solution is obtained, when 0.5 mole solute is dissolved in

    A
    250 ml solvent
    B
    250 g solvent
    C
    250 ml solution
    D
    1000 ml solvent

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