Chemistry <span title="question..Electrolysis...?">question..Electrolysis......</span>

Question

The electrolysis of an aqueous solution of NaCl has the overall reaction:

2H2O +2Cl^- ----> H2+Cl2+2OH^-

During the electrolysis, 2.6 x 10^22 electrons pass through the cell. What is teh mass of the Cl2 produced?

Thanks!

Answer 1

using avagadro&#039;s number:

2.6 x 10^22 electrons @ 6.022 e23 items / mole = 0.0432moles of electrons

since: 2 Cl- --&gt;  Cl2 &amp; 2 mol electrons,

0.0432 mol e- @ 1 mol Cl2 / 2 mol e- 0.0216 moles of Cl2 are produced

using molar mass of chlorine:

0.0216 moles Cl2 @ 70.9 g/mole = 1.53 grams of chlorine are produced

your answer is(2 sig figs) : 1.5 grams of Cl2