2	The following table gives some results from experiments in which the current efficiency						
	of zinc deposition in an electrowinning operation was determined at various current						
	densities (amperes per square meter of cathode surface area). The cathode area at						
	the plant is 10,000 m2.						
	Current Density		Cell Voltage		Current Efficiency		
	(A/m2)		(V)		(%)		
	300		1.5		92		
	400		2.3		88		
	500		3		82		
	600		3.9		72		
	700		4.8		52		
	800		5.8		10		
							
							
	To investigate the tradeoff between increased production rate (increased current						
	density) and cost please make a Table consisting of the following columns. Column 1						
	is the current density transferred from the Table above. For the other columns, please						
	provide a sample calculation below the Table.						
	a) Column 2 is the calculated production rate of Zn in kg/day (don’t forget to take the						
	current efficiency into account).						
	b) Column 3 is the calculated energy consumed per day in units of kilowatt hours						
	(kWh). Please recall that a volt has units of joules/coulomb and an amphere has						
	units of coulombs/sec.						
	c) Column 4 is the energy consumed per kg Zn produced.						
	d) Column 5 is the cost of producing a kg of Zn. To perform this calculation, assume						
	that the cost of electricity is $0.06 per kWh and the plant costs $20,000 to run per						
	day (labor, heating, insurance, etc.).						
	e) Which production rate minimizes the cost of Zn production in dollars per kg?