$2)$ NH$3$ reacts with an excess of O$2,$ according to the reaction:

$4$NH$3+5$O$2->4$NO $+6$H$2$O

The single pass conversion is $70\%.$ Based on the flowchart below, calculate:

a$)$ The flow rate of NO at the exit of the separator

ANSWER $(100$ kg$.$mol$1.$h$1)$