Answered Essay: 2. Select all of the following that you would predict to have a positive Δ 2 NO2 (g) → N2 (g) +

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2. Select all of the following that you would predict to have a positive Δ 2 NO2 (g) → N2 (g) + 2。2 (g) 2502 (g) + O2(g) → 2 SO3 (g) 2 C6H6 (l) + 15 02(g) → 12 CO2 (g) + 6 H2O (g) □ 4 NO (g) + 6 H2O (g) → 4 NH3 (g) + 5。2 (g) 2 BF3 (g) + 3 CaO (s) → B203 (s) + 3 CaF2 (s) 4 C (s) + S8 (s) → 4 CS2 (I) 02 (g) → 2 O (g) CuO (s) + H2 (g) → Cu (s) + H20 (I)

2. Select all of the following that you would predict to have a positive Δ 2 NO2 (g) → N2 (g) + 2。2 (g) 2502 (g) + O2(g) → 2 SO3 (g) 2 C6H6 (l) + 15 02(g) → 12 CO2 (g) + 6 H2O (g) □ 4 NO (g) + 6 H2O (g) → 4 NH3 (g) + 5。2 (g) 2 BF3 (g) + 3 CaO (s) → B203 (s) + 3 CaF2 (s) 4 C (s) + S8 (s) → 4 CS2 (I) 02 (g) → 2 O (g) CuO (s) + H2 (g) → Cu (s) + H20 (I)

Expert Answer

Answer

Entropy is a measure of chaos; therefore, the more chaotic it becomes, the more entropy increases.

In general:

Entropy increases with the number of particles/moles in the system:

1 mol of AB has less entropy than 1 mol of A and 1 mol of B; due to higher amount of microstates

Entropy increases as the volume of particles increases. This can be compared with physical states

Volume of Solid < Volume of Liquid << Volume of Gas

Therefore, Gases have higher entropy than liquids and solids. Liquids have higher entropy than solids.

As T increases, the entropy increases, by definition, since it is a state function which depends on Temperature.

Mixture typically increases Entropy, so ordered states get higher amount of microstates.

Example could be Gas A + Gas B separated by a membrane, then eventually mixing A + B, microstates increases, meaning that entropy increases

Knowing this:

Q2.

a)

2 mol of NO2, produce,s 1+2 = 3 mol of gases, therefore, dS increases, positive

b)

2+1 = 3 mol of of gases produce 2 mol of gases, there is decrease in chaos, dS is negative

c)

15 mol of gas yield 12+6 = 18 mol of gas, therefore, this is positive in dS

d)

4+6 = 10 mol of gas –> 4+5 = 9 mol of gas, there is decreasein entropy, dS is negative

e)

2 mol of gas produce just solids, so chaos decreases, dS is negative

f)

solids will produce liquids, which ar ehigher in entropy, so dS is positive

g)

1 mol of O2 = 2 mol of O; therefore, more chaos, dS is positive

h)

1 mol of gas forms only liquids + solids

therefore, entropy decreases, dS is negative

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