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cat carbune de puritate 60% arde in 6 moli O2?

Răspuns :

 
x    6moli
C+O2=CO2
 x  6moli
C+O2=CO2
1   1

x=6moliC=6.12=72gC


100gC---------60g C pur
a-----------------72gC
a=100.72:60=120gC cu impuritati