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m= ?
Mr H2O = 18
n = N/Na
m/Mr = N/Na
m/18 = 10^23 / 6,02.10^23
m = 18.10^23/6,02.10^23 = 2,99 gram
10^23 = n . 6,02x10^23
n= 0,166 mol
Massa=n.Mr
Massa=0,166. 18
Massa=2,988 gram