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= 20 / 400
= 5.10^-2 mol
2. mol = massa/Mr
= 4,6 / 100 = 46.10^-3 mol
3. JP = mol.6,02.10^23
= 4/12 . 6,02.10^23
= 2,01.10^23
= 201.10^21
4. massa=mol.Mr
= 5.10^-2 x 71
= 355.10^-2 gram