One half-cell in a voltaic cell is constructed from a copper wire electrode in a 4.0 x 10 M solution of Cu(NO3)2. The other half-cell consists of a zinc electrode in a 0.75 M solution of Zn(NO3)2. Calculate the cell potential. You may need to use the following data: Zn2+ (aq) + 2 e Zn(s) E' = -0.763 V Cu?+ (aq) + 2 e" → Cu(s) E' =+0.337 V Potential =| v

The gas ammonia is diffusing at steady state through nitrogen by equimolar counterdiffusion in a conduit 1.22 m long at 25 °C and a total pressure of 101.32 kPa. The partial pressure of ammonia is 25.33 kPa at the left end and 5.066 kPa at the other end. The cross section of the conduit is in the shape of a circle, the diamater being 0.0610 m at the left end and tapering uniformly to 0.0305 m at the right end. Calculate the molar flow rate of ammonia in kg mol/s. The diffusivity DAB = 0.230 × 10-4 m2/s.

In an evaporator, dilute material enters, and concentrated material leaves the system. Water is evaporated during the process. If I am the weight of the dilute material entering the system, W is the weight of water vaporized, and C is the weight of the concentrate, write an equation that represents the total mass balance for the system. Assume that a steady state exists. Show FBD and complete solution.

To find CP/CV of a gas, one sometimes uses the following method. A certain amount of gas with initial temperature T0, pressure P0, and volume V0 is heated by a current through a platinum wire for a time t. The experiment is done twice: first with a constant volume V0 with pressure changing from P0 to P1, and then at a constant pressure P0 with the volume changing from V0 to V1. The time t is the same in both experiments. Find the ratio CP/CV. The gas may be considered ideal.