Theoretical yield of  ${\text{NH}}_3$ obtained in Haber’s process by reacting 56 g of ${\text{N}}_2$ and 12 g of ${\text{H}}_2$ is

Theoretical yield of  ${\text{NH}}_3$ obtained in Haber’s process by reacting 56 g of  ${\text{N}}_2$ and 12 g of ${\text{H}}_2$is 68 g.

${\text{N}}_2+3{\text{H}}_2\to 2{\text{NH}}_{\text{3}}\Rightarrow$ 28g of ${\text{N}}_2$and 6g of ${\text{H}}_2$ given 34g of ${\text{NH}}_3$ here double the amount.