I need help with question 80? 74.(A)AT, C3.0Ni2.01.0T0.0A and B react exothermically to form a compound. A series of experiments is performed inwhich varying ratios of A to B are used, with a constant total number of moles, in each case. Theobserved temperature rise is plotted above. The simplest formula for the compound is probably(A) A3B₂ (B) A₂B3 (C) AB₂ (D) AB0.275. If a 17.0 g sample of impure nickel metal reacts under standard conditions with 25.0 L of CO toform 6.25 L of Ni(CO)4 gas, what is the percentage of Ni in the metal sample?Ni(s) + 4CO(g) →→ Ni(CO)4(g)Molar Masses58.7 g.mol-¹Ni(CO)4171. g.mol-124.1% (B) 25.0% (C) 96.4%Fe3+(0.4 0.6 0.8 1.0mole fraction of AThermochemistry76. Which molecule has the greatest bond energy?(A) H-Br (B) H-F (C) H-At (D) H-Cl(E) H-I77. For which process is the entropy change per mole the largest at constant temperature?(A)H₂O) → H₂O(g) (B)H₂O(s)→ H₂O(g) (C)H₂O(s) → H₂O) (D)H₂O) → H₂O(s)78. Under which conditions does nitrogen have the largest entropy per mole?(A) N₂(s) at 50 K and 1 atmN₂) at 70 K and 1 atm(C)N2(g) at 80 K and 1 atmN2(g) at 80 K and 0.5 atm(B)(D)(D) 100%79. In which process is entropy decreased?(A)dissolving sugar in water (B)expanding a gas80. Which reaction has the largest positive entropyS(s) + 3F2(g) → SF6(g)(A)(B)(C)(aq) + SCN (aq) → FeSCN²+ (aq)(C)evaporating a liquidchange per mole of product formed?SO2(g) + Na₂O(s) → Na₂SO3(s)(D) H₂O) → H₂O(g)(D)freezing water

Entropy of a reaction is defined as the increase in degree of randomness of product molecules…

Answered: I need help with question 80?

Science

Chemistry

I need help with question 80?

Chemistry: Principles and Reactions

8th Edition

ISBN:9781305079373

Author:William L. Masterton, Cecile N. Hurley

Publisher:William L. Masterton, Cecile N. Hurley

Chapter16: Spontaneity Of Reaction

Section: Chapter Questions

Problem 32QAP

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Solutions

Solutions can be considered as homogeneous mixtures which contain two or more than two chemical substances. The chemical substance which is the greater part is defined as solvent. And the chemical substance that is dissolved in a solvent is referred to as solute. Solution chemistry plays an important role in chemistry since it supports many commercial applications of solutions.

Question

I need help with question 80?

74.
(A)
AT, C
3.0
Ni
2.0
1.0
T
0.0
A and B react exothermically to form a compound. A series of experiments is performed in
which varying ratios of A to B are used, with a constant total number of moles, in each case. The
observed temperature rise is plotted above. The simplest formula for the compound is probably
(A) A3B₂ (B) A₂B3 (C) AB₂ (D) AB
0.2
75. If a 17.0 g sample of impure nickel metal reacts under standard conditions with 25.0 L of CO to
form 6.25 L of Ni(CO)4 gas, what is the percentage of Ni in the metal sample?
Ni(s) + 4CO(g) →→ Ni(CO)4(g)
Molar Masses
58.7 g.mol-¹
Ni(CO)4171. g.mol-1
24.1% (B) 25.0% (C) 96.4%
Fe3+(
0.4 0.6 0.8 1.0
mole fraction of A
Thermochemistry
76. Which molecule has the greatest bond energy?
(A) H-Br (B) H-F (C) H-At (D) H-Cl
(E) H-I
77. For which process is the entropy change per mole the largest at constant temperature?
(A)H₂O) → H₂O(g) (B)H₂O(s)→ H₂O(g) (C)H₂O(s) → H₂O) (D)H₂O) → H₂O(s)
78. Under which conditions does nitrogen have the largest entropy per mole?
(A) N₂(s) at 50 K and 1 atm
N₂) at 70 K and 1 atm
(C)
N2(g) at 80 K and 1 atm
N2(g) at 80 K and 0.5 atm
(B)
(D)
(D) 100%
79. In which process is entropy decreased?
(A)dissolving sugar in water (B)expanding a gas
80. Which reaction has the largest positive entropy
S(s) + 3F2(g) → SF6(g)
(A)
(B)
(C)
(aq) + SCN (aq) → FeSCN²+ (aq)
(C)evaporating a liquid
change per mole of product formed?
SO2(g) + Na₂O(s) → Na₂SO3(s)
(D) H₂O) → H₂O(g)
(D)freezing water

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