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mC2H6=12*2+1*6=24+6=30u
mKOH= 39+16+1=56u
mMg(NO3)2=24+14*2+16*6=148u
m C2H6 = 12 × 2 + 1 × 6 = 24 + 6 = 30u
m KOH = 39 + 16 + 1 =56u
m Mg (NO3) 2 = 24 + 14 × 2 + 16 × 6 = 148u
Myślę że jest dobrze i że dostaniesz +6