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22 July, 22:45

5.00 g of molten NaCl is at its melting temperature. The salt is added to 25.00 mL water at 25.0 °C in a coffee cup calorimeter. The salt becomes solid and the temperature of the water increases to 47.9 °C. a) Calculate the amount of heat transferred.

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  1. 22 July, 23:06
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    heat absorbed by water = 2.39 KJ

    Explanation:

    given,

    mass of molten NaCl = 5 g

    mass of water = 25 g

    Temperature of water = 25.0 °C

    Temperature increased to = 47.9 °C

    heat absorbed by water = m S ΔT

    S is specific heat in J/gm °C

    Specific heat of water = 4.184 J/gm °C

    m is mass of water

    heat absorbed by water = 25 x 4.184 x (47.9-25)

    = 25 x 4.184 x 22.9

    = 2395.34 J

    heat absorbed by water = 2.39 KJ
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