Chemistry
Chemistry
Problem
A 3.00 A current runs through molten NaBr for 1 930 s. During this time 672 mL of Br₂(g) is collected at 1 atm and 0 °C. How many electrons are required to produce one molecule of Br₂ under these conditions?Intuitive explanation
The key is connecting three pieces: the current and time tell you total charge passed, Faraday's laws convert that to moles of electrons, and the gas volume gives you moles of produced. Once you know both quantities, their ratio reveals how many electrons are needed per molecule—which is really asking about the stoichiometry of the cathode reaction where bromide ions gain electrons.
Intuitive explanation
The key is connecting three pieces: the current and time tell you total charge passed, Faraday's laws convert that to moles of electrons, and the gas volume gives you moles of produced. Once you know both quantities, their ratio reveals how many electrons are needed per molecule—which is really asking about the stoichiometry of the cathode reaction where bromide ions gain electrons.