CT: R2Ox
R2Ox + 2xHCl \(\rightarrow\) 2RClx + xH2O
pt: 2R + 16x 2R + 71x
de: 5,6 11,1
Ta co: \(11,1\left(2R+16x\right)=5,6\left(2R+71x\right)\)
\(\Leftrightarrow22,2R+177,6x=11,2R+397,6x\)
\(\Leftrightarrow11R=220x\)
\(\Leftrightarrow R=20x\)
biện luận:
+ x = 1 => R = 20(loại)
+ x = 2 => R = 40 (lay)
=> CT: CaO