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Ce masa de Carbon se afla intro cantitate de Carbonta de Calciu care contin 8 g Calciu. Se da ACa40 AC12 AO16


Răspuns :

CaCO3 are masa molara 40+12+3*16=100 g/mol

100.......................40g Ca
x............................8g Ca

x= 800:40=20g CaCO3

20g...................y g C
100....................12

y=240:100=2,4 g C