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4 November, 17:30

How much heat is needed to raise the temperature of 9g of water by 20C

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  1. 4 November, 18:24
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    753.48 J

    Explanation:

    To increase the temperature of of m grams of water by n°C, you need to provide it with:

    heat = m x n x specific heat

    This will account for increasing the temperature of the first gram of water by n°C until you reach m grams of water.

    q = mcΔT

    where q = heat absorbed,

    m = mass of sample,

    c = specific heat of the substance; and

    ΔT = the change in temperature

    We know that the specific heat of water is 4.186 joule/gram °C so putting the values in the formula to get:

    q = 9 x 4.186 x (20 - 0) = 753.48 J
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