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Masa de dioxid de carbon in care se gaseste aceeasi cantitate de oxigen ca in 360g apa este:
a) 44g
b)88g
c)320g
d)440g


Răspuns :

MH2O = 18g/mol

18g H2O..........................16g O
360g H2O..........................x = 320g O

1 mol CO2............................44g CO2
x moli CO2............................320g 

x = 7,27 moli

m CO2 = 7,27*44 = 320g