Bonjour:
1) M= 9 x 12 + 8 x 1 + 4 x 16 = 180 g.mol
2) n=m/M =500E-3/180 =2,77E-3 mol
3) N= n x Na = 2,77E-3 x 6,022E23 = 1,67E21
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Bonjour:
1) M= 9 x 12 + 8 x 1 + 4 x 16 = 180 g.mol
2) n=m/M =500E-3/180 =2,77E-3 mol
3) N= n x Na = 2,77E-3 x 6,022E23 = 1,67E21