Question

quantos gramas apresentam 1,0.1012 moleculas de oxido ferrico (Fe2O3)

Answer 1

Fórmula: Fe₂O₃MM: 160g

160g --- 6,02 x 10²³
xg ------- 1,0 x 10¹²
2,657 x 10¹²g

Answer 2

$\mathsf{1~mol~de~molec}\\\mathsf{6\times{10}^{23}~molec}\\\mathsf{5~mols~de~atom}\\\mathsf{5\times{6}\times{10}^{23}~atom}\\\mathsf{160g/mol}$

$\mathsf{160g\to~6\times{10}^{23}~molec}\\\mathsf{x\to~1\times{10}^{12}molec}$

$\mathsf{6\times{10}^{23}~x=160\times{1}\times{10}^{12}}\\\mathsf{x=\dfrac{160\times{10}^{12}}{6\times{10}^{23}}}$

$\mathsf{x=26,6\times{10}^{-11}g}$