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6 April, 21:58

How much heat energy is required to raise the temperature of 5 kilograms of coal from 20°C to 220°C?

a. 1,314,718 J

b. 314 J

c. 4,187,000 J

d. 6,573 J

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Answers (1)
  1. 6 April, 22:01
    0
    Given:

    5 kg of coal

    T1 = 20°C, T2 = 220°C

    Required:

    Q (heat energy)

    Solution:

    The specific heat of coal (bituminous) is 1.315 kJ/kg-K

    Q = mcp (T2-T1)

    Q = 5kg (1.315 kJ/kg-K) (220 - 20)

    Note that T (°C) = T (K)

    Q = 1315 kJ or 1315000 J

    Since 1315000 J is close to 1314718 J, the answer is letter A.
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