Question

A heating unit disperses 1000 J of heat into its surroundings. At which of the following temperatures will the entropy change of the surroundings be the greatest? O AS system = -AS surroundings, regardless of the ambient temperature ooc O 25 C O 50C O 100C Question 2 (4 points) Calculate the standard entropy change (S rxn) for the following reaction: U (s) + 3 F2 (g) → UF6 (s) 0-431 J/K 0-254 J/K O228 J/K O 886 J/K 0254 J/K

Answer 1

Generally we say when temperature is increased, it causes the Kinetic energy of the molecules to be increased and hence increase in randomness or entropy.

But if we consider a system already giving out heat or we can say surrounding accepting heat, when heat is added to something at lower temperatures , it causes higher entropy than heat added to a system at higher temperatures. Because at already high temperature, the particles are already in random motion. So the heat added wouldn't create much of a difference than when at lower temperatures because there the particles are not moving so freely so when the same amount of heat would be added to that system, it will cause a higher increase in randomness or entropy.

So at OK , entropy change of surroundings would be highest.

Hence option b is correct

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