3) How many L of gas is equal to 89.3 moles at STP?

The correct answer is 1999 l

Explanation:

We use the formula P V = nRT. The normal conditions of temperature and pressure are 273K and 1 atm, we use the gas constant = 0, 082 l atm / K mol:

1 atm x V = 0, 082 l atm / K mol  x 89, 3 mol x 273 K

V =0, 082 l atm / K mol  x 89, 3 mol x 273 K / 1 atm

V= 1999 , 06 l

In system A: A gas and a solid react to form a new solid product. the system entropy decreases.

In System B: Rubbing alcohol evaporates on the skin. liquid alcohol is converting to gas by evaporation so the system entropy increases.

Explanation:

Entropy  is a thermodynamic quantity measure the degree of disorder of a certain system.

Gases have larger entropy compared to liquids  which is larger than solids.

(A) When a gas convert to a solid, its entropy decreases. ... because solids have less energy and entropy than solids.

So, in system A: A gas and a solid react to form a new solid product. the system entropy decreases.

(B) Any chemical reaction that increases the number of gas molecules also increases entropy.

So, in System B: Rubbing alcohol evaporates on the skin. liquid alcohol is converting to gas by evaporation so the system entropy increases