Oblicz masę cząsteczkową podanych substancji:
mC2H4 =
mNa2S =
mAl(OH)3=
mC2H4 =
mNa2S =
mAl(OH)3=
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a)
= 2 · 12 + 4 · 1 = 28 u
b)
= 2 · 23 + 32 = 78 u
c)
= 27 + 3 · 16 + 3 · 1 = 78 u