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14 June, 19:15

When a 3.00 g 3.00 g sample of KBr KBr is dissolved in water in a calorimeter that has a total heat capacity of 1.36 kJ ⋅ K - 1, 1.36 kJ⋅K-1, the temperature decreases by 0.370 K. 0.370 K. Calculate the molar heat of solution of KBr. KBr.

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  1. 14 June, 21:47
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    Molar heat of solution of KBr is 20.0kJ/mol

    Explanation:

    Molar heat of solution is defined as the energy released (negative) or absorbed (Positive) per mole of solute being dissolved in solvent.

    The dissolution of KBr is:

    KBr → K⁺ + Br⁻

    In the calorimeter, the temperature decreases 0.370K, that means the solution absorbes energy in this process. The energy is:

    q = 1.36kJK⁻¹ * 0.370K

    q = 0.5032kJ

    Moles of KBr in 3.00g are:

    3.00g * (1mol / 119g) = 0.0252moles

    Thus, molar heat of solution of KBr is:

    0.5032kJ / 0.0252moles = 20.0kJ/mol
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