hoa hoc

[linhhuy]

dot chay hoan toan chat huu co A CAN 6,72l O2(dkc) .Dan toan bo san pham gom CO2, H2O vao dung dich Ba(OH)2 thi thu duoc 19,7g ket tua , dong thoi binh chua tang 18,6g . tach lay ket tua sau do them dd NaOH du vao nuoc loc.Xuat hien them 19,7 g ket tua ,xac dinh cong thuc phan tu A biet Mx lon hon 50 nho hon 80

 

[tran1995]

mco2+mH2o = 18.6
theo bai ra trong dung dich co hai muoi BaCO3va Ba(HCO3)2
=>nco2=0.1+2*0.1=0.3
=> nH2O=0.3
ADBTKL mA=9 g
=> trong a co ,CH ,o
goi ctpt CxHyOz
x:y:z= 1:2:1
ctdg (CH2O)n
dua vao gia thiet xac dinh cong thuc phan tu