All of the hydrogen halides (H-X) are gaseous in their natural state, but dissolve in water to form the aqueous phase.
Entropies (S) for the gaseous H-X molecules (before reaction) are:
HCl (g): 186.79 J/mol
HI (g): 206.33 J/mol
Entropies (S) for the H-X molecules dissolved/solvated in water (after reaction) are:
HCl (aq): 143.17 J/mol
HI (aq): 219.8 J/mol
1. Calculate the ΔS that each of these H-X compounds undergoes as it transitions from the gas phase to the aqueous phase.

The ΔS value of HCl undergoing transitions from gas to the aqueous phase is -43.62 J/mol.

The ΔS value of HI undergoing transitions from gas to the aqueous phase is 13.47 J/mol.

Explanation:

Entropy of the reaction :

1) Entropies the gaseous HCl molecules=

Entropies the aqueous HCl molecules=

The ΔS value of HCl undergoing transitions from gas to the aqueous phase is -43.62 J/mol.

2) Entropies the gaseous HI molecules=

Entropies the aqueous HI molecules=

The ΔS value of HI undergoing transitions from gas to the aqueous phase is 13.47 J/mol.

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e

answer; 4 electrons;