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ME = 78/2=39
MS=32
110-32 = 78
E to postas K
K2S
b)Na2 E2 O3-o masie czasteczkowej 158u
MNa = 23*2=46
ME = 58/2=29
MO=3*16=48
158-46-48=58
E to Krzem Si
Na2Si2O3