Unit 7 Quiz: Princ of Chemistry II and Lab Section 1

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Question 1

5 / 5 points

Using the data given below at 25°C, calculate the change in enthalpy (ΔH°) for the following reaction:

2PCl₃(g) + O₂(g) → 2POCl₃(g)

Species	ΔH _fE (kJ/mol)
O₂(g)	0
PCl₃(g)	-288.07
POCl₃(g)	-542.2

Question options:

830.27 kJ

b)	-830.27 kJ

254.13 kJ

d)	-508.26 kJ

Question 2

5 / 5 points

Which of the following would have the highest entropy assuming one mole of each substance and the same temperature for each.

Question options:

H₂O(l)

H₂O(aq)

H₂O(g)

H₂O(s)

Question 3

5 / 5 points

Select the correct statement of the first law of thermodynamics.

Question options:

a)	Energy is conserved, or, mathematically, ΔE = q + w

b)	In a spontaneous process, the entropy of the universe increases

c)	At a temperature of 0 K the entropy of a pure crystalline solid is zero

Question 4

5 / 5 points

For the following reaction, the change in free energy, ΔG°, is 4.73 kJ/mol at 25°C. Determine the equilibrium constant.

N₂O₄(g) $\Leftrightarrow$ 2NO₂(g)

Question options:

6.74

0.148

1.91

-1.91

Question 5

5 / 5 points

From the following reaction at the same temperature, select the reaction in which entropy increases.

Question options:

a)	Na⁺(aq) + Cl^–(aq) → NaCl(s)

b)	PCl₃(g) + Cl₂(g) → PCl₅(g)

c)	2NO₂(g) → N₂O₄(g)

d)	MgCO₃(s) → MgO(s) + CO₂(g)

Question 6

0 / 5 points

Calculate ΔG° for the reaction below at a temperature of 25°C, given that ΔH° = 92.22 kJ and ΔS° = 198.9 J/K.

2NH₃ (g) → 3H₂(g) + N₂(g)

Question options:

-151.52

32.92 kJ

151.52 kJ

-32.92 kJ

Question 7

5 / 5 points

Select the molecule with the highest gas-phase absolute entropy at 25°C.

Question options:

C₅H₁₂

C₂H₆

C₄H₁₀

CH₄

Question 8

0 / 5 points

When the change in free energy for a reaction, (ΔG°) is positive, the correct statement for the equilibrium constant K_eq is:

Question options:

K_eq > 1

K_eq = 0

K_eq = 1

K_eq < 1

Question 9

0 / 5 points

Which of the following would have the highest entropy assuming one mole of each substance and the same temperature for each.

Question options:

He(g)

H₂(l)

HBrO₄(s)

HBr(l)

Question 10

5 / 5 points

Select the correct statement of the third law of thermodynamics.

Question options:

a)	In a spontaneous process, the entropy of the universe increases

b)	Energy is conserved, or, mathematically, ΔE = q + w

c)	At a temperature of 0 K the entropy of a pure crystalline solid is zero

Question 11

5 / 5 points

Which of the following is not a state function?

Question options:

heat

Question 12

5 / 5 points

An _____ reaction is a spontaneous reaction in which the standard change in free energy is negative.

Question options:

a)	exothermic

b)	endergonic

exergonic

Question 13

0 / 5 points

The following generic reaction will always be spontaneous if the change in enthalpy is _________ and the change in entropy is __________.

A + B → C

Question options:

a)	negative, positive

b)	positive, negative

c)	negative, negative

d)	positive, positive

Question 14

0 / 5 points

Given the following information at 25°C, calculate ΔS° for the reaction:

2NO₂(g) → N₂O₄(g)

Species	S° J/(mol.K)
NO₂(g)	240.06
N₂O₄(g)	304.29

Question options:

a)	544.35 J/K

b)	-64.23 J/K

c)	-175.83 J/K

d)	175.83 J/K

Question 15

5 / 5 points

Calculate ΔG° for the reaction below at a temperature of 25°C, given that ΔH° = 52.96 kJ and ΔS° = 166.4 J/K.
2HI(g) → H₂(g) + I₂(g)

Question options:

49.6 kJ

3.35 kJ

-49.6 kJ

-3.35 kJ

Question 16

0 / 5 points

What is the ΔG° if ΔH° is -58.7 kJ and ΔS° is -129 J/K?

Question options:

+20.2 kJ

+55.5 kJ

-20.2 kJ

Question 17

5 / 5 points

Calculate ΔS° for this reaction using the thermodynamic data provided below.

2PbS(s) + 3O₂(g) → 2PbO(s) + 2SO₂(g)

Species	S° J/(mol.K)
PbS(s)	91.2
O₂(g)	205.0
PbO(s)	69.45
SO₂(g)	248.5

Question options:

a)	-161.5 J/K.mol

b)	120.6 J/K.mol

c)	-579.4 J/K.mol

d)	229.8 J/K.mol

Question 18

5 / 5 points

What is the ΔS° if the ΔH° is –199 kJ and ΔG ° is –197.78 kJ?

Question options:

-25 J/K

+0.25 J/K

4.1 J/K

25 J/K

–4.1 J/K

Question 19

0 / 5 points

The SI units are Joules (J) for each of the following EXCEPT ___________.

Question options:

Enthalpy

Entropy

Work

d)	Free energy

Question 20

5 / 5 points

Given the following information at 25°C, calculate ΔH° for the combustion of one mole of propane, C₃H₈, according to the equation

C₃H₈(g) + 5 O₂(g) → 3 CO₂(g) + 4 H₂O(l)

Species	ΔH _fE (kJ/mol)
C₃H₈(g)	-103.8
CO₂(g)	-393.5
H₂O(l)	-285.8
O₂(g)	0

Question options:

782.3

575.5

-2219.9

-575.5

Attempt Score:

65 / 100 – 65 %

Overall Grade (highest attempt):

65 / 100 – 65 %

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