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11 February, 01:31

the reaction of magnesium with hydrochloric acid carried out in a calorimeter caused the temperature of water to change from 25.0 Celsius to 36.0 Celsius. In this reaction 3760J of energy was released. What mass of water was present?

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  1. 11 February, 02:38
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    81.69g

    Explanation:

    Initial temperature (T1) = 25°C

    Final Temperature (T2) = 36°C

    Heat energy = 3760J

    Specific heat capacity of water (c) = 4.184J/g°C

    Mass (m) = ?

    Heat energy = Mc∇T

    Q = mc∇T = mc (T2 - T1)

    3760 = m * 4.184 * (36 - 25)

    3760 = 4.184m * 11

    3760 = 46.024m

    M = 3760 / 46.024

    M = 81.69g

    Mass of water is 81.69g
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