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For the process O2(g) → 2O(g), ΔH° = 498 kJ·mol–1.  What would be the predicted sign of ΔS°rxn and the conditions under which this reaction would be spontaneous?

For the galvanic cell at 298 K                                            Zn(s) + 2In2+(aq)→ Zn2+(aq) + 2In+(aq)                    Eocell =  0.36 V What is the equilibrium constant, K?

After 55 years, what mass (in g) remains of a 200.0 g sample of a radioactive isotope with a half-life of 10.0 years?

For the synthesis of nitrogen dioxide, NO2:                                            2N2(g) + O2(g) → 2NO2(g) this reaction has the energy diagram shown.  What is the spontaneity of the reaction?

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What is the coefficient for water when the reaction is balanced in acidic solution? Cr2O72–(aq) + Mn2+(aq) → Cr3+(aq) + MnO2(s)              unbalanced

What statement about a galvanic cell constructed with Cu+/Cu and Fe2+/Fe is correct? Standard Reduction Potentials Eored / V Cu+ + e– → Cu +0.52 Fe2+ + 2e– → Fe –0.44

Which aqueous solution all at 25 oC will have the lowest osmotic pressure?  

Silver chromate (Ag2CrO4; Ksp = 1.1×10–12) has a molar solubility of 6.5×10–5 M. What calculation provides the concentration of silver ions in a saturated solution of Ag2CrO4?

The neutralization reaction of HNO2 and a strong base is based on:                                            HNO2(aq) + OH–(aq) → H2O(l) + NO2–(aq)               K = 4.5×1010 What is the standard change in Gibbs free energy at 25 oC?