XO+H2SO4\(\rightarrow\)XSO4+H2O
- Gọi a là số mol XO\(\rightarrow\)số mol H2SO4 là a mol\(\rightarrow\)số mol XSO4 a mol
\(m_{ddH_2SO_4}=\dfrac{98a.100}{14}g\)
\(C\%_{XSO_4}=\dfrac{\left(X+96\right)a.100}{\left(X+16\right)a+\dfrac{98a.100}{14}}=16,2\)
\(\dfrac{\left(X+96\right).1400}{14X+10024}=16,2\)
1400X+134400=226,8X+162388,8
1173,2X=27988,8
X\(\approx\)24(Mg) suy ra oxit MgO