baconwhale671
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The mass of a an atom of helium is 6.65 x 10^−24. Use scientific notation to express the mass of 250 helium atoms.


A) 1.6625 x 10−21

B) 1.6625 x 10−22

C) 1.6625 x 10−24

D) 1.6625 x 10−26

Respuesta :

cometailthehash
1.6625 x 10−21

mass of one helium atom x 250 
Express 250 as 2.50.
(6.65 x 10−24)(2.50 x 102)
16.625 x 10−22

i took the test and it's actually A) 1.6625 x 10−21 :)

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