Posted by **alf** on Wednesday, August 3, 2005 at 9:24pm.

How much heat energy is required to raise the temp of 5 kilograms of coal from 20 degree celsius to 220 degrees celsius?

314 j

6,573 j

4,187,000 j

1,314,718 j

You need the specific heat of coal to answer that question, and that depends somewhat upon the type. Did they mention a value to use? This article:

AIChE Journal Volume 31, Issue 10 , Pages 1714 - 1717

mentions a specific heat value of

C = 1.05 kJ/Kg C

That would make the heat required

(1.05 kJ/kg C)* 5 kg * 200 C = 1,050,000 kJ

That is closest to the last of your choices.

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