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19-05-2016
Chemistry

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Determine the number of atoms in 4.56x10-2g Na

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Willchemistry Willchemistry

01-06-2016

Molar mass Na = 23 g/mol

23 g ------------- 6.02 x 10²³ atoms
4.56 x 10⁻² g ----- ? atoms

atoms = 4.56 x 10⁻² x ( 6.02 x 10²³ ) / 23

atoms = 2.74 x 10²² / 23

= 1.19 x 10²¹ atoms

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