Atomic masses can be determined by electrolysis. In one hour, a current of 0.872
ID: 1007224 • Letter: A
Question
Atomic masses can be determined by electrolysis. In one hour, a current of 0.872 amperes deposits 0.562 grams of a certain metal, M, which is present in solution as M3+ ions.a. What is the atomic mass of the metal? b. Identify the metal. Atomic masses can be determined by electrolysis. In one hour, a current of 0.872 amperes deposits 0.562 grams of a certain metal, M, which is present in solution as M3+ ions.
a. What is the atomic mass of the metal? b. Identify the metal.
a. What is the atomic mass of the metal? b. Identify the metal.
Explanation / Answer
time = t = 1 hour = 3600 sec
current = i = 0.872 A
mass deposited = 0.562 g
from farady laws
W = E x i x t / F
0.562 = E x 0.872 x 3600 / 96485
E = 17.27
equivalent weight = atomic weight / 3
17.27 = atomic weight / 3
atomic weight = 51.82 g/mol
the metal corresponding to this is = Cr
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