i need help for the three questions

What is the calculated value of the cell potential at 298K for an electrochemical cell with the following reaction, when the Ag+concentration is 1.22M and Cr3+ concentration is 8.34104M ? Ecell=V3Ag+(aq)+Cr(s)3Ag(s)+Cr3+(aq) The cell reaction as written above is for the concentrations given. What is the calculated value of the cell potential at 298K for an electrochemical cell with the following reaction, when the Cu2+ concentration is 1.95104M and the Zn2+ concentration is 1.47M ? Ecell=VCu2+(aq)+Zn(s)Cu(s)+Zn2+(aq) The cell reaction as written above is for the concentrations given. What is the calculated value of the cell potential at 298K for an electrochemical cell with the following reaction, when the Cu2+ concentration is 9.61104M and the Mn2+ concentration is 1.09M ? Ecell=VCu2+(aq)+Mn(s)Cu(s)+Mn2+(aq) The cell reaction as written above is for the concentrations given