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in ce masa de carbonat de calciu se gasesc a)8g calciu.b)120g carbon.c)80mg oxigen?​

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Mezeialina22pbt0xcask

a)100×8/40=800/40=20gCaCO3

b)12gC________100gCaCo3

120gC________×

X=120×100/12=120/12=10

c)16gO______100g

80mg______×

x=80×100/16=80/16=5mg

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