Question

For the following reaction scheme, percentage yields are given along the arrow:

$Xg$ and $yg$ are mass of $R$ and $U$, respectively.
(Use : Molar mass (in $gmo{l}^{-1})$ of $H,C$ and $O$ as $1,12$ and $16$, respectively)
The value of $y$ is _______.

Answer 1

Answer:

Molar mass of ' $U$ ' $=122g$ or $100g$
$\underset{(0.1\text{ mole })}{P}\stackrel{100\%}{\to }\underset{(0.1\text{ mole })}{S}$
$\underset{(0.1\text{mole})}{2S}\underset{(80\%)}{\overset{\text{Aldol condensation}}{\to }}\underset{(\frac{0.1}{2}\times 0.8)}{T}\stackrel{80\%}{\to }\underset{(\frac{0.1}{2}\times 0.8\times .8)}{U}$
So, mass of '$U$' $=\frac{0.1}{2}\times 0.8\times 0.8\times 100=3.20gm$
Or
Mass of ' $U$ ' $=\frac{0.1}{2}\times 0.8\times 0.8\times 122=3.90gm$