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mol N2
= massa : Mr
7 : 28
0,25 mol
jumlah partikel
= mol x 6,02 x 10^23
0,25 x 6,02 x 10^23
1,505 x 10^23
= 7 / 14
= 0.5 Mol
n = N / No
0,5 = N / 6,023 x 10^23
N = 6,023 x 10^23 X 0,5
N = 3,01 x 10^23