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I need help with question 80?

I need help with question 80?

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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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
Transcribed Image Text: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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