Răspuns:
CH₃-OH metanol
MCH₃-OH=12+4×1 + 16=32g/mol
C₁₃H₁₈O₂ ibuprofen,
MC₁₃H₁₈O₂= 13×12+18×1+2×16=206g/mol
32g CH₃-OH..................16gO₂
64g..................................xgO₂
x=64×16/32=32gO₃
206g C₁₃H₁₈O₂..............................32gO₂
yg.................................................5×32gO₂
y=5×32×206/32=1030gO₂
Explicație: