Question

o dtt um inseticida largamente utilizado durante decadas e altamente toxico possui formula molecular c14h9clx e massa molecular 354,5u. determine o valor de x

Answer 1

$Ol\acute{a} \\ \\ Sendo~a~f\acute{o}rmula~molecular: \\ \\ C_{14}H_{9}Cl_{x}\begin{cases}Indica~que~sua~massa \\ molecular~e': \\ \boxed{354,5u}\end{cases} \\ \\ se~sabe~que: \\~~~~~~~~~~~~~~~~~~ C=12 \\ ~~~~~~~~~~~~~~~~~~H=1 \\ ~~~~~~~~~~~~~~~~~~Cl=35 \\ \\ Para~calcular~(x), faremos~da~diguente~maneira~veja:$

$C_{14}H_{9}Cl_{x}=354,5u \\ \\ (\underbrace{12.14+1.9}_{177}+35.x)=354,5u \\ \\ 177+35x=354,5u \\ \\ 35x=\underbrace{354,5-177}_{177,5} \\ \\ 35x=177,5 \\ \\ x= \frac{177,5}{35} \\ \\ x=5,07142...~~---\ \textgreater \ aproximando~seria:$

$\boxed{x=5} \\ \\ Ent\tilde{a}o~a~f\acute{o}rmula~sera' : \\ \\ \boxed{ \boxed{C_{14}H_{9}Cl_{5}}} \\ \\ \mathbb{aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa} \\ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~Espero~ter~ajudado!!$