# chemistry

How do you calculate the mass, in amu of 2287 atoms of Li

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1. sorry its 287 atoms

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2. Hey, if all hope is lost try this...let me know if it makes sense....

use stoicheometry.

(287 amu of Li/ 1 )*( 1 mol/ 6.02 x 10^23) * ( 6.94g Li/ 1 mol)

this makes more clearer as fractions on paper....hope this helps. i did this and got 3.31 x 10^-21. (numbers may vary slightly with decimals cuz of periodic tables and diff. masses.)

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