Friday

October 31, 2014

October 31, 2014

Posted by **anonymous** on Tuesday, April 24, 2007 at 7:29pm.

In an electrolytic cell, a current of 0.250 ampere is passed through a solution of a chloride of iron producing Fe(s) and Cl2(g).

a) write the equation fot he half-reaction that occurs at the anode

b) when the cell operates for 2.00 hrs, 0.521 g iron is deposited at one electrode. Determine the formula of the chloride of iron in the original solution.

c) write the balanced equation for the overall reaction that occurs in the cell.

d) how many liters of Cl2 (g), measured at 25 degrees celsius and 750 mm Hg are produced when the cell operates as described in part (b) ?

e. Calculate the current that would produce chlorine gas from the solution at a rate of 3.00 grams per hour.

ANSWERS:

a) 2 Cl- - 2e- --> Cl2

b) 0.0187 mol e-

0.00933 mol Fe-

about a 1:2 ratio therefore = Fe3+

I need help on c,d, and e please

a)Your equation is not balanced by charge. The charge is -4 on the left and zero on the right. The equation should be

2Cl^- ==> Cl2(g) + 2e

b)0.521=55.85= 0.00933 mol Fe(s)

0.0187 Faradays.

divide 0.0187/0.0187 = 1.00

0.00933/0.0187 = 0.499 = 0.500

A Faraday will deposit 1 mol of a univalent metal, 0.5 mol of a divalent metal, 0.333 mol of a trivalent metal, etc. SO, the change in electrons must have been 2 and not 3 as your answer suggests, and the formula is FeCl2. Another way is ox state = mol e/mol Fe = 0.01866/0.00933 = 2.000.

c). So anode is 2Cl^- ==> Cl2(g) + 2e

cathode is Fe^+2 + 2e ==> Fe(s)

Add the two to obtain the cell reaction.

d). 0.01866 C x 70.91/2 = ??grams

Convert to L at STP, then use PV = nRT to convert to the non-standard conditions.

e. I would put all of this into a formula and solve for the unknown.

A x hrs x 3600 s/hr x molar mass = 96,485 x grams x delta e.

A=??

hrs=1.00

molar mass = 70.906 g Cl2/mol Cl2.

grams = 3.00

delta e = 2

Solve for A.

Check my thinking. Check my arithmetic.

b)0.521=55.85= 0.00933 mol Fe(s)

0.521 g/55.85 = 0.00933 mol Fe(s).

**Answer this Question**

**Related Questions**

chemistry - The urine of horses are mixed with an excess of hydrochloric acid, ...

3rd grade - alice folded a piece of paper into 12 equal squares and colored them...

Discrete Math - A factory makes automobile parts. Each part has a code ...

8th grade math. - He ripped a piece of paper into three parts, and tore each of ...

Science 7R - contains all the same kind of cell???? what part of a cell is that...

I need answer fast - A machine will add 128 parts of water to l part of the kool...

math - a bathroom cleaner contains 1 part of bleach with 4 parts of water. if ...

chem - Explain, in terms of electrical energy, how the operation of a voltaic ...

Algebra 1 - You are making up your own mix of concrete to patch a set of stairs...

Science - Why is it rare for the soft parts of an organism to become a fossil? A...