Is this correct>What is the amount of heat energy released when a 5.0g sample of copper cools from 75 degrees celcius to 25 degrees celcius?  Ccu = 0.385 KJ/KgC (0.005kg) (0.385 KJ/KG C) (-50degrees)Would the answer be negative?  Would the degrees be multiplied as a negative since its cooling?

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Asked Dec 4, 2019
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Is this correct>

What is the amount of heat energy released when a 5.0g sample of copper cools from 75 degrees celcius to 25 degrees celcius?  Ccu = 0.385 KJ/KgC

 

(0.005kg) (0.385 KJ/KG C) (-50degrees)

Would the answer be negative?  Would the degrees be multiplied as a negative since its cooling?

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Expert Answer

Step 1

the heat energy released is,  

Q =me (T,-T)
CL
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Q =me (T,-T) CL

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Step 2

substitute the given ...

´10 kg
(0.385 KJ/kgC) (25°c-75°C)
1g
Q= (5.0g)
= -0.096 KJ
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´10 kg (0.385 KJ/kgC) (25°c-75°C) 1g Q= (5.0g) = -0.096 KJ

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Heat Transfer

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