Chemistry Help?

Question

An unknown metal (M) is electrolyzed. It took for a current 52.8 sec of 2.00 amps to plate 0.0719  g

of the metal from a solution containing M(NO3)3.

What is the metal? 

 

Answer 1

Step 1:

Time taken for the electrolysis of = 58.2 sec.

Current required for the electrolysis of = 2 amp.

Weight of plate = 0.0719g.

Convert charge into Moles per electron :

.

Step 2:

Now convert amount of substance per one electron.

.

Find out the Molecular weight.

Therefore Molecular Weight of the substance is 197.11 MW

From the periodic table, The substance having molecular weight 197.11 is Gold(Au).

Therefore metal is gold.

Solution:

The unknown metal is gold.