about this Bracha
100

what number bracha is this?

the 16th

200

what is the name of this bracha?

רצה

300

what was this bracha originally about?

before the beis hamikdash was destroyed it was about thanking hashem for accepting all the korbans 

400

name one topic about this bracha 

1: having the  beis hamikdash so we can continue our service 

2: hashems shechina should return to Yerushalayim

3: that hashem should accept the jewish peoples prayers with favor and compassion 

500

what is unique about this Bracha?

it serves as a general request for all our prayers to be accepted