Calculate the current strength and number of moles of electron
Answers
To determine the amount of current necessary to produce a known quantity of substance in a given amount of time:
Find the quantity of substance produced/or consumed in moles.
Write the equation for the half-reaction taking place.
Calculate the number of moles of electrons required.
Convert the moles of electrons into coulombs of charge.
Calculate the current required.
Example: What current is required to produce 400.0 L of hydrogen gas, measured at STP, from the electrolysis of water in 1 hour (3600 s)?
Calculate the number of moles of H2. (Remember, at STP, 1 mole of any gas occupies 22.4 L.)
Calculating moles of hydrogen
Write the equation for the half-reaction that takes place.
Hydrogen is produced during the reduction of water at the cathode. The equation for this half-reaction is:
4 e- + 4 H2O(l) --> 2 H2(g) + 4 OH-(aq)
Calculate the number of moles of electrons. According to the stoichiometry of the equation, 4 mole of e- are required to produce 2 moles of hydrogen gas, or 2 moles of e-'s for every one mole of hydrogen gas.
Finding the moles of electrons
Convert the moles of electrons into coulombs of charge.
Finding the coulombs of charge
Calculate the current required.
Calculation of the current.
Hope it helped.
Mark as brainliest.