Question

calcule o numero do atomo 392 g de ferro (fe) dada a massa molar = 56 g/mol​

Answer 1

$\Large\boxed{\begin{array}{l}\sf 56\,g\longrightarrow 6\cdot10^{23}\acute atomos\\\sf 392\longrightarrow x\\\sf 56x=392\cdot6\cdot10^{23}\\\\\sf x=\dfrac{392\cdot6\cdot10^{23}}{56}\\\\\sf x=42\cdot10^{23}\\\sf x=4,2\cdot10^{24}\acute atomos\end{array}}$