What is the percentage atom economy when formula weight of product obtained is 70 u and the sum of formula…
What is the percentage atom economy when formula weight of product obtained is 70 u and the sum of formula weight of reactant is 140 u ?
$30 \%$
$35 \%$
$50 \%$
$75 \%$
Solution
$\begin{aligned} & \% \text { atom economy } \\ & =\frac{\text { Formula weight of the desired product }}{\text { Sum of formula weight of all the }} \times 100 \\ & \text { reactants used in the reaction } \\ & =\frac{70 \mathrm{u}}{140 \mathrm{u}} \times 100=50 \%\end{aligned}$