A. From the cell voltage measured for the final studied, with CuCl2 at an unknown concentration , and the known half reaction potential for Zn/Zn^2+, calculate the reduction half potential for the Cu^2+/Cu half reaction and enter the value . half reaction Zn/Zn^2+ (+0.034 ) Final cell studied-cell voltage 1.070 v

voltage range 0.004

temperature 25.1

B. Now, from the difference of the standard potential for the cell , the observed potential, and the Nerst equation , determine the concentration of Cu^2+(aq) in the unknown solution and enter below . M

An external consultant recommends that a plant installs a bank of capacitors for power factor correction. this will reduce the peak electrical demand charges by an average of 93 kw every month. the plant current pays $13 per kw in peak demand charges. the capacitor bank will include 223 kw of fixed capacitors, and 183 of variable capacitors. the fixed capacitors cost $59 per kw, and the variable capacitors will cost $65 per kw. the consultant charges 21% of the equipment costs to install the capacitors. because this project will reduce the demand for the electric utility, they are prepared to provide a one-time rebate of $42 per kw of reduced demand. what is the simple payback period for this project (in years)?