chemistry

In a constant-pressure calorimeter, 60.0 mL of 0.300 M Ba(OH)2 was added to 60.0 mL of 0.600 M HCl. The reaction caused the temperature of the solution to rise from 21.75 °C to 25.84 °C. If the solution has the same density and specific heat as water (1.00 g/mL and 4.184 J/g·°C, respectively), what is ΔH for this reaction (per mole of H2O produced)? Assume that the total volume is the sum of the individual volumes.

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  1. ..Ba(OH)2 + 2HCl ==> BaCl2 + 2HCl

    mols Ba(OH)2 = 0.060 x 0.300 = 0.18
    mols HCl = 0.060 x 0.600 = 0.036

    mols Ba(OH)2 left = 0
    mols HCl left = 0
    mols H2O formed = 0.036

    q = dH = mass H2O x specific heat H2O x (Tfinal-Tinitial)
    Then convert J to kJ. That is ? kJ for 0.036. To find per mol it is
    dH/0.036 = ? kJ/mol. Approx 57 kJ/mol.

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