Since you need 1000 grams of chromium, we need to determine how many moles this represents. Since the mass of one mole of chromium is 52.00 g:

Since the appropriate half-reaction is:

, each mole of chromium requires three moles of electrons.

Since,

Electric power is the product of current and voltage. If we assume that this is being carried out at a standard 120 volts,

The time required for this process can be found by taking the quotient of the charge and the current,

The cost for the process can be found by taking the product of the price per kWh, the power (in kW), and the time (in hours).