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Se ard 44,8 cm cubi C2H6 . Calculeaza : volumul de aer ( cu 20% O2 in volume ) . masurat in conditii normale , consumat .

Răspuns :

C2H6 +7/2O2 ⇒ 2CO2 + 3H2O
22.4cm cubi C2H6 ...............7/2*22.4
44.8........................................x
x=156.8 cm cubi O2
Vaer= 784 cm cubi= 0.784 L