Question

Quantas moléculas estão presentes em 650g de H2SO3?

Answer 1

$\large\boxed{\begin{array}{l}\sf m_{H_2SO_3}=2\cdot1+32+3\cdot16=2+32+48=82\,g/mol\\\sf 6\cdot10^{23}\,mol\acute eculas\longrightarrow 82\,g\\\sf x\longrightarrow 650\,g\\\sf 82=650\cdot6\cdot10^{23}\\\sf x=\dfrac{650\cdot6\cdot10^{23}}{82} \\\\\sf x=47,56\cdot10^{23}\,mol\acute eculas\end{array}}$