Question

For an alloy that consists of 35 at% Zn and 65 at% Cu, what are the concentrations (a) of Zn (in weight percent), and (b) of Cu (in weight percent)?  

Answer 1

Solution:

Given that 35%Zn and 65% Cu

consider total alloy=100

then 35moles of Zn and 65moles of Cu

weight of 1mole of Zn=65.3g

weight of 35moles=65.3*35=2285.5g

weight of Cu=63.5g

weight of 65 moles = 65*63.5=4127.5g

total weight Zn + Cu=4127.5+2285.5g

                                =6413g

Zn weight percent =(2285.5/6413)*100

                             =35.65%

Cu weight percent=4127.5/6413)*100=64.35%