Question

how many joules of heat energy is given out by 400 g of copper at 450°C, when it cooled to 20°C. Specific heat capacity of copper is 0.4 Kg${–1}$ °C${–1}$​

Answer 1

Correct Question:

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How many joules of heat energy is given out by 400 g of copper at 450°C, when it cooled to 20°C. Specific heat capacity of copper is 0.4 Kg$^{–1}$ °C$^{–1}$

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Solution:

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68800 J

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Explanation:

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m = 400 g

c = 0.4 Jg$^{–1}$ °C$^{–1}$

${\theta_F}$ = 450 – 20

= 430° C

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where ‘m’ means mass of copper

‘c’ means Specific heat capacity of copper

and ‘${\theta_F}$’ means fall in temperature.

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Therefore, heat energy given by copper = mc ${\theta_F}$

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= 400 × 0.4 × 430

= 68800 J

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Thus, 68800 J of energy is given out by copper.

Answer 2

Answer:

68800 j is the answer

Explanation:

400*0.4*430= 68800j will be the correct answer