3. how many atoms are found in 0.000256 moles?

1.54×10^20 atoms

Explanation:

It's done by using the relation

N=n×L where,

N = number of entities present

n= amount of substance (mole)

L= Avogadro's constant which is 6.02×10^23

now from the question, given

n=0.000256

And L=6.02×10^23

N= 0.000256×6.02×10^23

N= 1.54×10^20 atoms

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