CT: R2Ox
R2Ox + xH2SO4 \(\rightarrow\) R2(SO4)x + xH2O
pt:2R + 16x 98x
de: 4,48 7,84
Ta co: 7,84(2R + 16x) = 439,04x
=> 15,68R + 125,44x = 439,04x
=> 15,68R = 313,6x
=> \(R=\dfrac{313,6x}{15,68}=20x\)
biện luận:
+ x = 1 => R = 20 (loai)
+ x = 2 => R = 40 (Lay)
Vậy CT: CaO