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7 February, 18:10

When 1.98 g of NaOH (molar mass = 40 g/mole) are added to 75.0 mL of a 0.350 M HCl solution in a coffee-cup calorimeter, the temperature changes from 21.7°C to 25.8°C. If the resulting solution has a mass of 78.2 grams and a specific heat capacity of 3.97 J/g°C, what is the enthalpy change (ΔHrxn) for this reaction in kJ/mole.

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  1. 7 February, 19:06
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    (ΔHrxn) = 1.273kJ/mol

    Explanation:

    Applying

    m=78.2, c = 3.97, ∆t = 25.8-21.7

    (ΔHrxn) = mc∆t

    =78.2 * 3.97 * 4.1 = 1.273kJ/mol
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