how many moles are 2.60x10^21 atomas of silicon?
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1 mole ➡️6.022 x 10^23
X mole ➡️2.60 x10^21atoms of silicon
x ➡️ 2.60x 10^ 21 /6.022x 10^23
=0.43 x 10 ^ -2
=4.3 x x10^-3 moles
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