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4 June, 22:19

A 6.22-kg piece of copper metal is heated from 20.5 °C to 324.3 °C. The specific heat of Cu is 0.385 Jg-1°C-1. a. Calculate the heat absorbed (in kJ) by the metal. b. How close is this heat capacity to the expected heat capacity at the classical limit?

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  1. 4 June, 22:29
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    a) 727.5 kJ

    Explanation:

    Step 1: Data given

    Mass of the piece of copper = 6.22 kg

    Initial temperature of the copper = 20.5 °C

    Final temperature of the copper = 324.3 °C

    Specific heat of copper = 0.385 J/g°C

    Step 2:

    Q = m*c*ΔT

    ⇒ with Q = heat transfer (in J)

    ⇒ with m = the mass of the object (in grams) = 6220 grams

    ⇒ with c = the specific heat capacity = 0.385 J/g°C

    ⇒ with ΔT = T2 - T1 = 324.3 - 20.5 = 303.8

    Q = 6220 grams * 0.385 J/g°C * 303.8 °C

    Q = 727509.9 J = 727.5 kJ

    b) This heat capacity is the heat capacity given for a copper at a temperature of 25°C
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