Aqueous copper(II) ions react with metallic zinc to produce aqueous zinc(II) ions and metallic copper: In this reaction, two electrons are transferred per copper(II) ion and 1.099 eV of energy is released per transferred electron. Calculate in millimoles the number of moles of copper ions that must react every second to produce a power output of 50.0 W.
The voltage across a tungsten wire is 13.50 V. The wire weighs 50.0 mg and requires 171 kJ/mol of energy to melt completely. Assuming that the wire is well insulated and the voltage across the wire does not change, calculate the minimum number of electrons that must pass through the wire for complete melting to take place.
Light with an energy of 2.254 eV per photon is absorbed by a solar cell with an efficiency of 23.2%. How many moles of photons must be absorbed each day to produce an average power output of 19.0 W?