mFeCO3= 9/38 x 15,2= 3,6(g) -> nFeCO3= 3,6/116= 14/29(mol)
=> mMg= 15,2- 3,6= 11,6(g) -> nMg=11,6/24= 29/60(mol)
PTHH: FeCO3 + H2SO4 -> FeSO4 + CO2 + H2O
14/29____________14/29_____________14/29(mol)
Mg + H2SO4 -> MgSO4 + H2
29/60____29/60____________29/60(mol)
Ta có:
\(M_Y=\dfrac{\dfrac{14}{29}.44+\dfrac{29}{60}.2}{\dfrac{14}{29}+\dfrac{29}{60}}=22,988\left(\dfrac{g}{mol}\right)\\ \rightarrow d_{\dfrac{Y}{H2}}=\dfrac{22,988}{2}=11,494\)
nH2SO4(p.ứ)=14/29 + 29/60=0,966(mol)
Gọi x,y lần lượt là số mol FeCO3 và Mg
Ta có : \(\left\{{}\begin{matrix}116x+24y=15,2\\\dfrac{116x}{24y}=\dfrac{9}{29}\end{matrix}\right.\)
=> \(\left\{{}\begin{matrix}x=\dfrac{9}{290}\\y=\dfrac{29}{60}\end{matrix}\right.\)
\(FeCO_3+H_2SO_4\rightarrow FeSO_4+CO_2+H_2O\)
\(\dfrac{9}{290}\)------>\(\dfrac{9}{290}\)--------------------->\(\dfrac{9}{290}\)
\(Mg+H_2SO_4\rightarrow MgSO_4+H_2\)
\(\dfrac{29}{60}\)----->\(\dfrac{29}{60}\)-------------------->\(\dfrac{29}{60}\)
=> \(M_Y=\dfrac{\dfrac{9}{290}.44+\dfrac{29}{60}.2}{\dfrac{9}{290}+\dfrac{29}{60}}=4,53\)
=>dY/H2= \(\dfrac{4,53}{2}=2,265\)
\(n_{H_2SO_4}=\dfrac{9}{290}+\dfrac{29}{60}=\dfrac{179}{348}\left(mol\right)\)
vậy ai đúng ai sai ạ, mn cho e í kiến đc k ạ, 2 bn ra 2 kqua khác nhau