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12 August, 18:55

When a 6.50-g sample of solid sodium hydroxide dissolves in 100.0 g of water in a coffee-cup calorimeter, the temperature rises from 21.6 degrees C to 37.8 degrees C. Calculate delta H (in kJ/mol NaOH) for the solution process. Assume that the specific heat of the solution is the same as that of pure water.

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  1. 12 August, 19:24
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    Total mass = 100 + 6.5 = 106.5 g

    Specific heat of water = 4.18 Joules/gram °C

    Q = mCpΔT

    Q = 106.5 x 4.18 x (37.8 - 21.6)

    Q = 7177 Joules

    Moles of NaOH:

    6.5 / (23 + 16 + 1)

    = 0.1625

    Enthalpy of reaction: 7177/0.1625

    = 441.7 kJ/mol NaOH
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