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28 December, 19:14

Mercury turns to a vapor at 629.88 K. How much heat is lost when 75.0 g of mercury vapor at 650 K condenses to a liquid at 297 K?

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  1. 28 December, 19:30
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    - 3706.5 J.

    Explanation:

    The heat lost by the copper can be calculated using the formula:

    Q = m. C.ΔT, where,

    Q is the amount of heat lost by the mercury,

    m is the mass of the copper (m = 75.0 g),

    C is the specific heat of Hg (C = 0.140 J/g.°C),

    ΔT is the temperature difference (the final temperature - the initial temperature (ΔT = (297 K - 273) °C - (650 K - 273) °C = - 353 °C).

    ∴ The amount of heat lost by the mercury Q = m. C.ΔT = (75.0 g) (0.140 J/g.°C) ( - 353 °C) = - 3706.5 J.
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