1point
for a reaction, a h= 198 kj. for which value of ta sis the reaction
spontaneous?
o a. -198 kj
o b. 198 kj
o c. oku
o d. 396 kj
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The correct answer is D. 396 kJ. ΔG will be negative for this value of TΔS indicating a spontaneous reaction.

Further Explanation:

A. -198 kJ FALSE because this gives a positive ΔG.

B. 198 kJ FALSE because this results in ΔG = 0. The reaction is at equilibrium.

C. 0 kJ FALSE because this results in a positive ΔG.

D. 396 kJ TRUE because this results in a negative ΔG.

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Keywords: Gibbs Free Energy, spontaneity

answer : one can design an experiment using a liquid and an additive that can be added to the liquid and observe the chemical changes in the reaction species.

one would need a beaker which is filled with a known amount of the liquid in which thermometer is placed to measure the temperature changes; after addition of the additive to the liquid solution one can note down the temperature change and find whether the reaction is endothermic or exothermic in nature. by subtracting the initial temperature value with the final temperature one can find the temperature changes.

various combinations of liquid and additive can be used. liquid in this case can be a known quantity of water and additives can be epsom salt or without epsom salt the experiment can be conducted to notice the changes. water and ice, hydrogen peroxide and dry yeast, vinegar and baking soda,etc.