8) селен. w=Mo/Mв-ва; Mв-ва=Mo/w=16*3/0.378=126.96
Mэ=126.96-48=78.9
9)
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8) селен. w=Mo/Mв-ва; Mв-ва=Mo/w=16*3/0.378=126.96
Mэ=126.96-48=78.9
9)