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21 February, 19:33

If a 375ml sample of water was cooled from 37.5 C to 0 C, how much heat was lost in joules?

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  1. 21 February, 19:42
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    To answer this item, we use 1 g/mL as the conventional density of water at any temperature. Thus, the amount of water in grams is,

    m = (375 mL) x (1g/mL) = 375 g

    Then, we use the equation

    H = mcpdT

    where m is the mass, cp is the specific heat of water (4.18 J/g°C), and dT is the temperature difference. Substituting,

    H = (375 g) (4.18 J/g°C) (0° - 37°)

    = - 57997.5°C

    Therefore, the amount of heat released is equal to 57,997.5°C.
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