Question

Determine o número de mols existentes em 55,2 gramas de álcool etílico (c2h60).​

Answer 1

$\boxed{\begin{array}{l}\sf massa~molar: 2\cdot12+60\cdot1=24+60=84~g/mol\\\sf 1~mol\longrightarrow 84~g\\\sf x\longrightarrow 55,2~g\\\sf 84x=55,2\\\sf x=\dfrac{55,2}{84}\\\sf x=0,657\\\end{array}}$