By the electrolysis of water, 11.2L of oxygen at STP was prepared.
a) What charge was required?
b) If a current of 0.5A was used, how long would it take?
Standard temperature and pressure means 1 mole of gas = 22.4 L, so here we are producing 0.5 moles. What we really need to know however is how many moles of electrons are needed to produce 0.5 moles ...
The solution involves a calculation of the charge (number of electrons) needed for a half reaction in electrolysis. Additionally, the time of reaction is calculated given a value of the current used.