Mass of one atom of 'X' is 6.642x10 to the power -23 g. What is its atomic mass?
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As we knowthat1moleofanyatom=6.022*10^23 atoms
Or we can say that 6.022*10^23 atoms have mass=1 mol=atomic mass of that element.
Now mass of one atom= 6.642 *10^-23g
Mass of 6.022*10^23 atoms =
(6.022*10^23)*( 6.642 *10^ -23]
= 39.998124
= 39.9
~40u ..is your ans.
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