How long must a current of 10 amps be passed through molten BaCl₂ to produce 15 g of metallic barium?

Question

Quizplus · Accepted Answer

To calculate the time, use Faraday's laws of electrolysis. The molar mass of Ba is 137.33 g/mol, and the reaction is Ba^2+ + 2e^- → Ba. Therefore, 2 moles of electrons are needed per mole of Ba. Using the formula: time (s) = (mass * n * F) / (current * molar mass), where F is Faraday's constant (96485 C/mol), the time is approximately 2100 seconds or 35 minutes.

How Long Must a Current of 10 Amps Be Passed