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12 June, 21:42

How much energy is released when 20.0 g of water is cooled from 50°C to 30°C (Cwater = 4.18 J / g*°C)

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  1. 12 June, 22:50
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    1672 J

    Explanation:

    We are supposed to find out the energy released by water when cooled from 50° C to 30°C.

    We have the relation that,

    H=msΔT

    Information is given that s=4.18 J / g*°C,

    m=20.0 g,

    and ΔT is - 20° C.

    Hence by substituting we get,

    H=-20*20*4.18

    (minus symbol represents that energy is being released)

    1672 J is release when water is cooled from 50° C to 30°C.
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