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Answer :
The energy change when the temperature of the 12.4 grams of the solid silicon is decreased from the 8.4 °C to 22.1 °C is 120.6 J.
The mass of the solid silicon = 12.4 g
The initial temperature = 8.4 °C
The final temperature = 22.1 °C
The specific heat of solid silicon = 0.71 J/g °C
The heat energy expressed is as :
q = mc ΔT
where,
m = mass = 12.4 g
c = specific heat = 0.71 J/g °C
ΔT = 22.1 °C - 8.4 °C
= 13.7 °C
By solving the values :
q = 12.4 ×0.71 × 13.7
q = 120.6 J
The heat energy required is 120.6 J.
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