Multiple choice question regarding changes in entropy.

Which of the following reactions is likely to have the most positive change in entropy? a. N2(g)+3H2-->2NH3(g) b. CaO(s)+CO2--->CaCO3(s) c. N2(g)+2O2(g)-->2NO2(g) d. C(s)+)O2(g)-->CO2(g) e. 2C(s)+O2(g)-->2CO(g)

Voltaic cell

A voltaic cell is based uon the following overall reaction: 2H+(aq)+Sn(s)-->H2(g)+Sn2+(aq) where E=0.141V Calculate the equilibrium constant at 25 degrees Celsius.

Calculating the change in G for a voltaic cell.

Calculate the change in G for a voltaic cell with E= +0.309V if the overall reaction involves a 3 electron reduction.

Calculating the change in G.

What is the change in G at 55 degrees Celsius for a reaction with a change in H=124kJ and change in S = 83.1J/K?

A multiple choice question about the equality of delta G and delta H.

The change in G and the change in H are equal: a. At O degrees Cesius b. At O degrees K c. When concentrations equal 1M and partal pressure equal 1 atm d. When all reactants and products are in the same phase e. When the reaction is exothermic