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The air in a kitchen has a mass of 60.0kg and a specific heat of 1505J/(kg°C).

What is the change in thermal energy of the air when it warms from 24°C to 31°C?
A) 90,300J
B) 100,835J
C) 630,000J
D) 632,100J

Respuesta :

Your answer is 632,100J which is Choice D
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Answer: The answer is D.

So you have 60kg of air, and the specific heat per kilogram is 1505j/(kg°C), this means you need 1505j to increase 1°C to the temperature of a mass of 1kg of air.

So, if the change in temperature is from 24°C to 31°C, you are increasing 7°C to 60kg of air.

then, for each degree you need 60*1505 j= 90300j

and for 7°c you need 7*90300j = 632100j, wich is answer D.

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