Which of the following processes involves the greatest increase in entropy? SO_3

Question

Which of the following processes involves the greatest increase in entropy? SO_3(g) + H_2(g) rightarrow SO_2(g) + H_2O(g) N_2(g) + 3H_2(g) rightarrow 2NH_3(g) Ag^+(aq) + Cl+- (aq) rightarrow AgCl(s) MgSO_3(s) rightarrow MgO(s) + SO_2(g) A 1.0 g sample cashew was burned in a calorimeter containing 1000. g of water and the temperature changed from 20.0 degree C. In 25.0 degree another experiment, 3.0 g sample of a marshmallow burned in a calorimeter containing 2000.g of water the temperature of water changed from 25.0 degree C to 30.0 degree C. Based on the data, which of the following be concluded about the energy content for 1.0 g of each of the can two substances? a. combustion of 1.0 g of cashew releases less energy than the combustion of 1.0 g of marshmallow b. The combustion of 1.0 g of cashew releases the same amount of energy as the combustion of 1.0 g of marshmallow c. The combustion of 1.0 g cashew releases more energy than the combustion of 1.0 g of marshmallow d. No comparison can be made because the two systems started with different masses of food, different masses of water and different initial temperatures

Explanation / Answer

Question 6.

increase in entropy --> production of gas, increase of energy of phase ( i.e. from solid to liquid, liquid to vapor or solid to vapor). therefore:

a)

2 mol of gases in products, 2 mol of gases in reactatns, incrase is not noticeable

b)

2 mol produced from 4 mol, there is a decrease in entropy

c)

2 ions form 1 molecule, there is decrease

d)

1 mol of solid produces 1 mol of gas + 1 mol of solid

there is chaos created, i.e entropy is increased

the best answer is then D

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