Question

Quantos mols de átomos existem em 180 g de NH3?

Answer 1

$\Large\boxed{\begin{array}{l}\sf 4\,mols\,de\,\acute atomos\longrightarrow17\,g\\\sf x\longrightarrow 180\,g\\\sf 17x=4\cdot180\\\sf x=\dfrac{720}{17}\\\\\sf x=42,35\,mols\,de\,\acute atomos\end{array}}$