Q. What is the value of R (ideal gas constant) in L·atm/(K·mol)?
A.
0.0821
B.
8.314
C.
62.36
D.
0.0831
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Solution
The ideal gas constant R is 0.0821 L·atm/(K·mol).
Correct Answer: A — 0.0821
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Q. What is the value of R in the ideal gas equation PV=nRT?
A.
0.0821 L·atm/(K·mol)
B.
8.314 J/(K·mol)
C.
62.36 L·mmHg/(K·mol)
D.
All of the above
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Solution
R can have different values depending on the units used, including 0.0821 L·atm/(K·mol), 8.314 J/(K·mol), and 62.36 L·mmHg/(K·mol).
Correct Answer: D — All of the above
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Q. What is the value of the equilibrium constant Kc for the reaction A + B ⇌ C + D at 25°C if the concentrations are [A]=0.1 M, [B]=0.2 M, [C]=0.3 M, [D]=0.4 M?
A.
0.5
B.
1.0
C.
2.0
D.
4.0
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Solution
Kc = ([C][D]) / ([A][B]) = (0.3 * 0.4) / (0.1 * 0.2) = 2.0
Correct Answer: C — 2.0
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Q. What is the value of the equilibrium constant Kc for the reaction A + B ⇌ C at 25°C if the concentrations are [A] = 0.1 M, [B] = 0.2 M, and [C] = 0.3 M?
A.
0.5
B.
1.0
C.
1.5
D.
2.0
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Solution
Kc = [C]/([A][B]) = 0.3/(0.1*0.2) = 1.5
Correct Answer: B — 1.0
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Q. What is the value of the equilibrium constant Kc for the reaction: 2A ⇌ B + C if at equilibrium [A] = 0.5 M, [B] = 0.2 M, and [C] = 0.3 M?
A.
0.12
B.
0.30
C.
0.60
D.
1.20
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Solution
Kc = [B][C] / [A]^2 = (0.2)(0.3) / (0.5)^2 = 0.12 / 0.25 = 0.48.
Correct Answer: C — 0.60
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Q. What is the value of the equilibrium constant Kp for the reaction 2NO2(g) ⇌ N2O4(g) at a certain temperature?
A.
Kp = (P_N2O4) / (P_NO2)^2
B.
Kp = (P_NO2)^2 / (P_N2O4)
C.
Kp = (P_N2O4)^2 / (P_NO2)
D.
Kp = (P_NO2) / (P_N2O4)^2
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Solution
Kp is defined as the partial pressure of products over reactants, raised to the power of their coefficients.
Correct Answer: A — Kp = (P_N2O4) / (P_NO2)^2
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Q. What is the value of the equilibrium constant Kp for the reaction: N2(g) + 3H2(g) ⇌ 2NH3(g) at 25°C?
A.
0.5
B.
1.0
C.
0.1
D.
Depends on the initial concentrations
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Solution
The value of Kp is specific to the reaction conditions and cannot be determined without knowing the initial concentrations or the extent of the reaction.
Correct Answer: D — Depends on the initial concentrations
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Q. What is the value of the gas constant R in L·atm/(K·mol)?
A.
0.0821
B.
8.314
C.
0.08314
D.
1.987
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Solution
The gas constant R is 0.0821 L·atm/(K·mol).
Correct Answer: A — 0.0821
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Q. What is the value of the principal quantum number (n) for an electron in the 4f subshell?
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Solution
The principal quantum number n for the f subshell is 4.
Correct Answer: B — 4
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Q. What is the value of the principal quantum number (n) for an electron in the 4s orbital?
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Solution
The principal quantum number (n) indicates the energy level of the electron. For 4s, n=4.
Correct Answer: D — 4
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Q. What is the value of the principal quantum number (n) for an electron in the ground state of a hydrogen atom?
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Solution
In the ground state, the electron is in the first energy level, which corresponds to n=1.
Correct Answer: B — 1
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Q. What is the value of the principal quantum number (n) for the outermost electron in potassium (K)?
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Solution
Potassium has the electronic configuration [Ar] 4s1, so the outermost electron is in n=4.
Correct Answer: B — 4
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Q. What is the value of the principal quantum number (n) for the outermost electrons in a sodium atom?
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Solution
Sodium has an atomic number of 11, and its electron configuration is 1s² 2s² 2p⁶ 3s¹. The outermost electrons are in n=3.
Correct Answer: C — 3
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Q. What is the value of the principal quantum number (n) for the outermost electron in a potassium atom?
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Solution
Potassium (K) has an atomic number of 19, and its electron configuration ends in 4s, so the outermost electron has n=4.
Correct Answer: C — 3
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Q. What is the value of the principal quantum number for an electron in the ground state of a hydrogen atom?
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Solution
The ground state of hydrogen corresponds to n=1.
Correct Answer: A — 1
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Q. What is the value of the principal quantum number for the outermost electrons in potassium (K)?
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Solution
Potassium has an atomic number of 19, and its outermost electrons are in the n=4 shell.
Correct Answer: D — 4
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Q. What is the value of the principal quantum number for the outermost electrons in a sodium atom?
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Solution
Sodium has an atomic number of 11, and its outermost electrons are in the n=3 shell.
Correct Answer: C — 3
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Q. What is the value of the universal gas constant R in L·atm/(K·mol)?
A.
0.0821
B.
8.314
C.
62.36
D.
1.987
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Solution
The universal gas constant R is 0.0821 L·atm/(K·mol).
Correct Answer: A — 0.0821
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Q. What is the van 't Hoff factor (i) for a strong electrolyte like NaCl in solution?
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Solution
NaCl dissociates into two ions (Na+ and Cl-), so the van 't Hoff factor (i) is 2.
Correct Answer: B — 2
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Q. What is the van 't Hoff factor (i) for a strong electrolyte that completely dissociates into 3 ions?
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Solution
The van 't Hoff factor (i) is equal to the number of particles the solute dissociates into. For a strong electrolyte that dissociates into 3 ions, i = 3.
Correct Answer: C — 3
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Q. What is the van 't Hoff factor (i) for glucose in solution?
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Solution
The van 't Hoff factor (i) for glucose is 1, as it does not dissociate in solution.
Correct Answer: A — 1
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Q. What is the van 't Hoff factor for a non-electrolyte solute?
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Solution
For a non-electrolyte solute, the van 't Hoff factor (i) is 1, as it does not dissociate into ions.
Correct Answer: B — 1
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Q. What is the vapor pressure of a solution containing 0.1 mol of a non-volatile solute in 1 kg of water? (Vapor pressure of pure water = 23.76 mmHg)
A.
22.88 mmHg
B.
21.76 mmHg
C.
20.76 mmHg
D.
19.76 mmHg
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Solution
Vapor pressure = P°_solvent * (n_solvent / (n_solvent + n_solute)) = 23.76 * (55.5 / (55.5 + 0.1)) = 22.88 mmHg
Correct Answer: A — 22.88 mmHg
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Q. What is the vapor pressure of a solution containing 1 mole of a non-volatile solute in 9 moles of solvent, if the vapor pressure of the pure solvent is 100 mmHg?
A.
90 mmHg
B.
100 mmHg
C.
10 mmHg
D.
80 mmHg
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Solution
Using Raoult's law, P_solution = X_solvent * P°_solvent = (9/10) * 100 mmHg = 90 mmHg.
Correct Answer: A — 90 mmHg
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Q. What is the vapor pressure of a solution containing 1 mole of a non-volatile solute in 10 moles of solvent, assuming ideal behavior?
A.
0.1 P0
B.
0.9 P0
C.
1.0 P0
D.
0.5 P0
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Solution
Using Raoult's law, the vapor pressure of the solution = (moles of solvent / total moles) * P0 = (10 / 11) * P0 = 0.909 P0.
Correct Answer: B — 0.9 P0
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Q. What is the vapor pressure of a solution containing 1 mole of a non-volatile solute in 3 moles of solvent, assuming ideal behavior?
A.
0.25 P0
B.
0.75 P0
C.
1.0 P0
D.
0.5 P0
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Solution
Vapor pressure lowering = (moles of solute / total moles) * P0 = (1 / (1 + 3)) * P0 = 0.25 P0, so vapor pressure = P0 - 0.25 P0 = 0.75 P0.
Correct Answer: B — 0.75 P0
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Q. What is the vapor pressure of a solution containing 1 mole of non-volatile solute in 3 moles of solvent if the vapor pressure of the pure solvent is 100 mmHg?
A.
75 mmHg
B.
100 mmHg
C.
25 mmHg
D.
50 mmHg
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Solution
Using Raoult's law, P_solution = X_solvent * P°_solvent. X_solvent = 3/(1+3) = 0.75, so P_solution = 0.75 * 100 mmHg = 75 mmHg.
Correct Answer: A — 75 mmHg
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Q. What is the vapor pressure of a solution containing 1 mole of solute in 3 moles of solvent, assuming ideal behavior?
A.
0.25 P0
B.
0.75 P0
C.
0.5 P0
D.
P0
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Solution
Using Raoult's law, the vapor pressure of the solution = (moles of solvent / total moles) * P0 = (3 / (3 + 1)) * P0 = 0.75 P0.
Correct Answer: B — 0.75 P0
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Q. What is the vapor pressure of a solution containing a non-volatile solute compared to the pure solvent?
A.
Higher than the pure solvent
B.
Lower than the pure solvent
C.
Equal to the pure solvent
D.
Unpredictable
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Solution
The vapor pressure of a solution containing a non-volatile solute is lower than that of the pure solvent due to the presence of solute particles.
Correct Answer: B — Lower than the pure solvent
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Q. What is the volume occupied by 1 mole of an ideal gas at STP (Standard Temperature and Pressure)?
A.
22.4 L
B.
24.0 L
C.
18.0 L
D.
20.0 L
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Solution
At STP, 1 mole of an ideal gas occupies 22.4 liters.
Correct Answer: A — 22.4 L
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