- S 50%:
Gọi CT cần tìm là: \(SxOy\left(x;y\in N\text{*}\right)\)
\(\%O=50\%\)
Ta có:
\(\dfrac{32x}{16y}=\dfrac{50\%}{50\%}=1\Rightarrow\dfrac{x}{y}=\dfrac{1}{2}\Rightarrow x=1;y=2\) => CT: SO2
hoặc \(\dfrac{32x}{\left(32x+16y\right)}=\dfrac{50}{100}=\dfrac{1}{2}\Rightarrow x=1;y=2\) => CT: SO2
- Mn 49,6%:
Gọi CT cần tìm là: \(MnxOy\left(xy\in N\text{*}\right)\)
\(\%O=50,4\%\)
Ta có:
\(\dfrac{55x}{16y}=\dfrac{49,6}{50,4}\Rightarrow\dfrac{x}{y}=\dfrac{2}{7}\Rightarrow x=2;y=7\) => CT: Mn2O7
- Pb 86,6%
Gọi công thức cần tìm là: \(BxOy\left(x\in N\text{*}\right)\)
\(\%O=13,4\%\)
Ta có:
\(\dfrac{207x}{16y}=\dfrac{86,6}{13,4}\Rightarrow\dfrac{x}{y}=\dfrac{1}{2}\Rightarrow x=1;y=2\) => CT: B1O2
