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Mole Concept and Avogadro's Number

One atom of a...

Question

One atom of an element x weigh 6 into 10 to the minus 23 number of mole in 20 kg.

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Solution

Dear Student ,

 (given) Mass of 1 atom = 6.0 x 10^-23gm 
1 Gram atom = mass of 1 mole atoms = 6.022x 10²³x mass of one atom
 The mass of one mole of the atom is equal to 6.022 10²³ x 6.0 x 10^-23gm.= 36.132 g=0.0361 Kg. 

Therefore no. Of moles in 20000 g(20 kg)= 20000/36.132 = 553.52 moles 

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