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Elemental boron can be formed by reaction of boron trichloride with hydrogen. BCl3 (g) + 1.5 H2 (g) B (s) + 3 HCl (g) So(H2, g) = 130.6 J/K mol  So(B, s) = 5.87 J/K mol So(HCl, g) = 186.8 J/K mol If So(reaction) = 80.3 J/K for the reaction above, what is So for BCl3 (g)?    

A concentration cell consists of two Al/Al3+ electrodes. The electrolyte in compartment A is 0.050 M Al(NO3)3 and in compartment B is 1.25 M Al(NO3)3. What is the voltage of the cell at 25oC?

When the following redox equation is balanced with smallest whole number coefficients, the coefficient for Sn(OH)3- will be?  Bi(OH)3 (s) + Sn(OH)3- (aq) Sn(OH)62- (aq) + Bi (s) (basic solution)

A Voltaic cell consists of an Au/Au3+ electrode (Eo = 1.50 V) and a Cu/Cu2+ electrode (Eo = 0.34V). Calculate [Au3+] if [Cu2+] = 1.20 M and Ecell = 1.13 V at 25oC. (hints: the electrode with more positive Eo is the cathode and write the balanced equation by combining redox reactions occurring on cathode and anode)

Examine the phase diagram for the substance Bogusium (Bo) and select the correct statement.

Calculate So for the reaction: 4 Cr (s) + 3 O2 (g) 2 Cr2O3 (s)  So(Cr, s) = 23.77 J/K mol  So(O2, g) = 205.138 J/K mol So(Cr2O3, s) = 81.2 J/K mol  

Which relationship or statement best describes So for the following reaction? 2 NH3 (g) + 2 ClF3 (g) 6 HF (g) + N2 (g) + Cl2 (g)

A Voltaic cell is prepared using copper and silver. Its cell notation is shown below: Cu (s) Cu2+ (aq) Ag+ (aq) Ag (s)  Which of the following processes occurs at the cathode? 

The Voltaic cell made up of cobalt, copper, and their M2+ ions, has Ecello = 0.62 V. If Eo of the cathode half-cell is 0.34 V, what is Eo of the anode half-cell? Cu2+ (aq) + Co (s) Cu (s) + Co2+ (aq)

Which of the following is always true for an endothermic process?