When ignited,solid ammonium dichromate decomposes in a fiery display.This is the reaction for a "volcano" demonstration.The decomposition produces nitrogen gas,water vapor,and chromium(III)oxide.The temperature is constant at 25°C. -Determine $\Delta$S_univ° (in kJ/mol K).

Question

Quizplus · Accepted Answer

The correct answer is A because the change in entropy of the universe is equal to the sum of the changes in entropy of the system and the surroundings. In this case, the change in entropy of the system is zero because the temperature is constant. The change in entropy of the surroundings is positive because the reaction produces gases. Therefore, the change in entropy of the universe is positive.

When Ignited,solid Ammonium Dichromate Decomposes in a Fiery Display Δ\DeltaΔ Suniv° (In KJ/mol K)

When Ignited,solid Ammonium Dichromate Decomposes in a Fiery Display $\Delta$ S_univ° (In KJ/mol K)