3. Lighters are usually fueled by butane (C4H10). When 2.00 mol of butane burns at constant pressure, it produces 5316 kJ of heat and does 6.00 kJ of work. What are the values of ΔH and ΔU for the combustion of one mole of butane? (A) ΔΗ = −2658 kJ； ΔU = −2655 kJ (B) ΔΗ = −2658 kJ； ΔU = -3 kJ (C) ΔΗ = –2658 kJ； ΔU = −2661 kJ (D) ΔΗ = 5316 kJ； ΔU = 5322 kJ (E) ΔΗ = −5316 kJ； ΔU=-5322 kJ

3. Lighters are usually fueled by butane (C4H10). When 2.00 mol of butane burns at constant pressure, it produces 5316 kJ of heat and does 6.00 kJ of work. What are the values of ΔH and ΔU for the combustion of one mole of butane?
(A) ΔΗ = −2658 kJ； ΔU = −2655 kJ
(B) ΔΗ = −2658 kJ； ΔU = -3 kJ
(C) ΔΗ = –2658 kJ； ΔU = −2661 kJ
(D) ΔΗ = 5316 kJ； ΔU = 5322 kJ
(E) ΔΗ = −5316 kJ； ΔU=-5322 kJ

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統計： A(0), B(1), C(1), D(0), E(1) #3252545

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4. A strip of copper is placed in a 1 M solution of copper nitrate, and a strip of silver is placed in a 1 M solution of silver nitrate. The two metal strips are connected to a voltmeter by wires, and a salt bridge connects the solutions. The following standard reduction potentials apply: Ag+(aq) + e- → Ag(s) E° = +0.80 V Cu2+(aq) + 2e- → Cu(s) E° = +0.34 V When the voltmeter is removed and the two electrodes are connected by a wire, which of the following does .not. take place? (A) Negative ions pass through the salt bridge from the silver half-cell to the copper half-cell. (B) Some positive copper ions pass through the salt bridge from the copper half-cell to the silver half-cell. (C) The silver electrode increases in mass as the cell operates. (D) Electrons flow in the external circuit from the copper electrode to the silver electrode. (E) There is a net general movement of silver ions through the salt bridge to the copper half-cell.

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