Ile gramów krzemu znajduje się w 45g dwutlenku krzemu SiO₂?
28g Si - 60g SiO2 X - 45g SiO2 X=21g Si
40g Ca - 200g CaBr2 80g Ca - X X=400 g CaBr2
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28g Si - 60g SiO2
X - 45g SiO2
X=21g Si
40g Ca - 200g CaBr2
80g Ca - X
X=400 g CaBr2