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c=md*100/ms⇒md=c*ms/100
md=8*40/100
md=3.2g NaOH
Masa molara NaOH=23+16+1=40g/mol
Masa molara CO₂=12+2*16=44g/mol
x=masa de CO₂ reactionata
x=1.76g CO₂
Succes!