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A mug of coffee cools from 100 °C to room temperature, 20 °C. The mass of...

A mug of coffee cools from 100 °C to room temperature, 20 °C. The mass of the coffee is m 0.25 kg and its specific heat capacity may be assumed to be equal to that of water, c = 4190 J kg-1 Kl. Calculate the change in entropy
a ) coffee
b ) surroundings

Science   Advanced-Physics   
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Answer #1

As you can see, the sum of change of entropy for system(coffee) and surrounding is positive.

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