Question

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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Answer 1

136000 J or 136 kJ

Step-by-step 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.