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5 October, 14:21

How much heat must be absorbed by 125 g of ethanol to change its temperature from 21.5 ∘C to 34.8 ∘C? (Specific heat capacity of ethanol is 2.42 J/g∘C)

a. 86.6 kJ

b. 4.02*103kJ

c. 6.95 kJ

d. 4.02 kJ

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Answers (1)
  1. 5 October, 14:30
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    Option D. 4.02 kJ

    Explanation:

    A simple calorimetry problem

    Q = m. C. ΔT

    ΔT = Final T° - Initial T°

    C = Specific heat capacity

    m = mass

    Let's replace the data

    Q = 125 g. 2.42 J/g∘C. (34.8°C - 21.5 °C)

    Q = 4023.25 J

    We must convert the answer to kJ

    4023.25 J. 1kJ / 1000 = 4.02kJ
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