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Q.

1.19 gm mixture of Cu and Zn contains AI copper by weight and 3×1021 atom of zine. Find gram atoms of aluminium in given mixture?
 (At. mass of Al=27;Cu=63.55;Zn=65.0 ) 
NA=6×1023

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a

0.27

b

0.01

c

0.027

d

0.001

answer is C.

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Detailed Solution

Weight of Cu in mixture =1.19×50100=0.595g

WZn=3×10216×1023×65=0.595g

So, WAl=1.19−(0.595+0.325)g=0.27g

Gram atom or mole of Al=0.2727=0.01

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