Question

Quantos mols de átomos de Fe (ferro) há em14g de deste elemento?

Answer 1

$\large\boxed{\begin{array}{l}\rm 6,0\cdot 10^{23}\,\acute atomos\longrightarrow 56\,g\\\rm x\,\acute atomos\longrightarrow14\,g\\\rm 56x=14\cdot6\cdot10^{23}\\\rm x=\dfrac{\diagdown\!\!\!\!\!\!14\cdot6\cdot10^{23}}{\diagdown\!\!\!\!\!\!56_4}\\\\\rm x=\dfrac{6\cdot10^{23}}{4}\\\\\rm x=1,5\cdot10^{23}\,\acute atomos\end{array}}$