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jumlah partikel = (6,02 x 10^23) x 0,25
jumlah partikel = 1,505 x 10^23 partikel
mol=25/100=0,25mol
X=mol.L
x=partikel/atom/molekul
L= bil. avogrado=6,02x10^23
X=0,25.6,02x10^23
X=1,505x10^23 partikel