[usergust]

Hi Im having difficulties in solving these chem problems if anyone can guide me on what to do here i would be grateful..

* Calculate the Ecell for the reaction below when, Zn2+ = 1.00M , H+ = 1.00e-6 M , and P H2 = 1.00 atm.
                               Zn + 2H+ --> Zn2+ + H2.


*  Calculate the [H+] for the hydrogen half cell of the following voltaic cell if the observed cell voltage is 2.02 V.
                               Mg/ Mg2+ (1.0 M) // H+ (?M), H2 (1.00 atm) / Pt.