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II. Vocabulaire A. Chassez l’intrus  Find the word that does not belong. (6 pts.—1 ea.)

Consider the following redox reaction in an acidic solution: I–(aq)  +  NO3-(aq)  → NO(g)  +  I2(s) When the equation is balanced with smallest whole number coefficients, the coefficient for — (a) NO  = [a] (b) NO3-  = [b] (c) H+  = [c] (d) H2O  = [d]

At 298 K , ∆H = 520.0 kJ and ∆S = 184 J/K for the reaction shown below. MnO2(s)  ⟶ Mn(s) + O2(g) (a) Use the data to decide if this reaction is spontaneous at 298 K. [a] (b) What is the temperature above which the reaction is spontaneous? [b]

Calculate the molar solubility of M2X (Ksp = 1.3 x 10-21) in pure water. M2X(s) ⇌ 2M+(aq) + X2-(aq)

In the titration of 20.0 mL of 0.150 M HNO3 with 0.300 M NaOH, calculate the pH after the addition of 10.0 mL of NaOH. HNO3(aq) + NaOH(aq) → NaNO3(aq) + H2O(l)

What is the cell potential at 25oC for the concentration cell described by: Cu(s) | Cu2+(aq, 0.15 M) || Cu2+(aq, 0.75 M) | Cu(s)

Use the standard free energies of formation (∆Gof) data to calculate the equilibrium constant for the reaction at 298 K. 2AB(g) ⇌ A2(g) + B2(g) Substance (state) ∆Gof (kJ/mol) A2(g) 0 B2(g) 0 AB(g) -10.0

The pH of a 1.75 M solution of weak acid HA is 3.25. Calculate the value of Ka for HA.

For a certain reaction at 330 K, ∆Hsys = 9.9 kJ and ∆Ssys = 85 J/K, calculate ∆Suniv.

Calculate ΔG°rxn for the following reaction at 525 K. CH2O(g) +  2H2(g) → CH4(g)   +  H2O(g) ΔH° = -94.9 kJ;  ΔS° = -224.2 J/K Answer: ΔG°rxn  = [a] kJ