Question

05 - Sabendo que a massa molecular do Césio é igual a 133 g/mol, determine o número de átomos desse elemento, contidos em 13 Kg. (Dado: Número de Avogadro = 6,0 x 10²³).​

Answer 1

$\Large\boxed{\begin{array}{l}\sf 13\,kg=13\cdot10^3\,g\\\sf 133\,g\longrightarrow 6\cdot10^{23}\,\acute atomos\\\sf 13\cdot10^3\,g\longrightarrow x\\\sf 133x=13\cdot6\cdot10^{23}\\\\\sf x=\dfrac{78\cdot10^{23}}{133}\\\\\sf x=0,58\cdot10^{23}\\\sf x=5,8\cdot10^{22}\,\acute atomos\end{array}}$