Practice Exam III for Chem for Majors II

Practice Exam III for Chem for Majors II - Practice Exam...

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Practice Exam III for Chem for Majors II 1. Calculate the value of D H for this reaction. C 2 H 4 (g) + H 2 (g) C 2 H 6 (g) Substance (kJ·mol –1 ) C 2 H 4 (g) 52.5 C 2 H 6 (g) –84.7 (A) –137.2 kJ (C) 32.2 kJ (B) –32.2 kJ (D) 137.2 kJ 2. More heat is derived from cooling one gram of steam at 100 °C to water at 50 °C than from cooling one gram of liquid water at 100 °C to 50 °C, why? 3. In which process is entropy decreased? (A) dissolving sugar in water (B) expanding a gas (C) evaporating a liquid (D) freezing water 4. Compound (kJ·mol –1 ) SO 2 (g) –301 SO 3 (g) –401 What is Δ G 0 for this reaction at 298 K? 2SO 2 (g) + O 2 (g) 2SO 3 (g) (A) –142 kJ(B) –200 kJ(C) –744 kJ(D) 142 kJ
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5. Which reaction is nonspontaneous in the direction written? Standard Reduction Potentials E 0 Mg Mg 2+ + 2 e 2.37 V Al Al 3+ + 3 e 1.66 V Zn Zn 2+ + 2 e 0.76 V Fe Fe 2+ + 2 e 0.44 V Cu Cu 2+ + 2 e –0.34 V Ag Ag + + e –0.80 V (A) Cu + 2Ag + 2Ag + Cu 2+ (B) Fe 2+ + Zn Fe + Zn 2+ (C) 2Al + 3Mg 2+ 2Al 3+ + 3Mg (D) 2Al + 3Zn 2+ 2Al 3+ + 3Zn 6. A reaction is nonspontaneous at all temperatures if (A) Δ H and Δ S are both positive. (B) Δ H and Δ S are both negative. (C) Δ H is positive and Δ S is negative. (D)
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Practice Exam III for Chem for Majors II - Practice Exam...

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