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26 December, 05:04

The student places 0.5 kg of potato into a pan of water.

During cooking, the temperature of the potato increases from 20 °C to 100 °C

The specific heat capacity of the potato is 3400 J/kg °C

Calculate the change in thermal energy of the potato.

Use the equation:

change in thermal energy = mass * specific heat capacity temperature change

[3 marks]

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Answers (1)
  1. 26 December, 08:03
    0
    136000 J or 136 kJ

    Explanation:

    Formula

    Heat = m * c * deltaH

    Givens

    m = 0.5 kg

    c = 3400 J / (kg * oC)

    Deltat = (100oC - 20oC)

    deltat = 80oC

    Solution

    Heat = 0.5 kg * 3400 J / (kg * oC) * 80oC

    Heat = 136000 Joules

    Heat = 136 kg

    Technically there is only 1 place of accuracy.
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