Question

What is the composition of Cobalt in atom percent, if the alloy consists of 4.5 wt% Germanium and 95.5 wt% of Cobalt?

Answer 1

The weight percents (Wt%) of Germanium and Cobalt in the given alloy = 4.5 and 95.5, respectively.

Let's consider the no. of Germanium and Cobalt atoms in the alloy = x and y, respectively.

The atomic weights (A. W.) of Germanium and Cobalt = 73 and 59, respectively.

Here, We need to find out the atom percent (At%) of Cobalt in the alloy.

(At%)_Co = 100*(Wt%)_Co*(A. W.)_Ge/[(Wt%)_Ge*(A. W.)_Co + (Wt%)_Co*(A. W.)_Ge]

= 100*95.5*73/[4.5*59 + 95.5*73]

= 100*6971.5/[265.5 + 6971.5]

= 100*6971.5/7237

= 96.3

Therefore, the composition of Cobalt (in atom percent) in the alloy = 96.3