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B.
2.
Massa = n.Mr
2=n.2
n=1mol
X=n.L
X=1. 6,02x10^23
X=6,02x10^23 partikel
3.
1,204x10^23=n.6,02x10^23
n=0,2mol
Massa=0,2.17=3,4g