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12 July, 13:53

What quantity of heat is required to change 20g of ice at - 25°c to steam at 120°c

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  1. 12 July, 16:17
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    Answer: 5289 joules

    Explanation:

    The quantity of Heat Energy (Q) required to heat a substance depends on its Mass (M), specific heat capacity (C) and change in temperature (Φ)

    Thus, Q = MCΦ

    Since, Mass of ice = 20 g

    C is not provided (Recall that the specific heat capacity of ice is 2.010J/g°C)

    Φ = (Final temperature - Initial temperature)

    (120°C - (-25°C) =

    120°C + 25°C = 145°C

    Thus, Q = 20g x 2.010J/g°C x 145°C

    Q = 5829J

    Thus, 5829Joules of heat energy is required to heat ice
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