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please explain the question given in the image as ASAP

Dear Student,According to Dulong and Petit law,Atomic mass = 6.4specific heat = 6.40.16 = 40 gSo, correct option is 1) 40 g

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specific heat*at. wgt =6.4 
Dulong and Petit's law : The product of atomic weight and specific heat of a solid element is 6.4 nearly. Therefore, approximate atomic weight= 6.4 / Specific heat 
ans is 40
 
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