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Each mole of particles have 6.02 x 10^23 particles.
(3.6 x 10^20) / (6.02 x 10^23) = 0.000598 mol of Silicon
Ar of Si (Silicon) = 28.1g/mol
mass = number of moles x Ar
mass = 0.000598 mol x 28.1g/mol = 0.0168g of silicon
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