A sample of anthracite has a moisture content of 5% when mined and an energy density of 35 kJg-1 when completely dried.

Question

Assuming that during combustion, the temperature of the water in the un-dried coal is raised from 20.0oC to 100.oC, and then vaporized at 100.oC, estimate the energy density of the coal when it is mined.

(HINTS: i. use a 100.g sample of coal; ii. find energy needed to vaporize the water in that sample; iii. make sure to keep the units consistent; you’ll need the calorimetry equation, and the latent heat of vaporization for coal.)

Answer 1

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