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Q.

The statue of liberty is made of 2.0×105 lbs of copper sheets bolted to a framework. 
(1 lb = 454 g) ? (Atomic weight: Cu = 63.5). If number of atoms of copper on the statue present is 8.61 × 10y , find ‘y’ (Atomic mass of copper = 63.5)
 

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answer is 29.

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Detailed Solution

29
No of copper atoms =2×105×45463.5×6.022×1023
     =8.61×1029

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