[tex]\boxed{\begin{array}{l}\underline{\rm c\acute alculo~da~massa~molar:}\\\sf m_{SO_2}=32+2\cdot16=32+32=64~g/mol\\\sf 250~ton=250\cdot10^3=2,5\cdot10^5~g\\\sf 64~g\longrightarrow 1~mol\\\sf2,5\cdot10^5\longrightarrow x\\\sf 64 x=2,5\cdot10^5\\\sf x=\dfrac{2,5\cdot10^5}{64}=\dfrac{2,5\cdot10^5}{6,4\cdot10^1}=0,390625\cdot10^4\\\sf x=3,90625\cdot10^3~mols\end{array}}[/tex]
[tex]\boxed{\begin{array}{l}\sf 64\longrightarrow 6\cdot10^{23}\\\sf 2,5\cdot10^5\longrightarrow x\\\sf 64x=6\cdot10^{23}\cdot2,5\cdot10^{5}\\\sf x=\dfrac{15\cdot10^{28}}{64}\\\sf x=0,234375\cdot10^{28}\\\sf x=2,34375\cdot10^{27}~mol\acute eculas\end{array}}[/tex]
