NEET 2015 Physics and Chemistry Cancelled Paper

Volume of nitrogen collected at 300 K and 725 mm pressure is 40 mL actual pressure= 725 – 25 = 700 mm
Volume of nitrogen at STP

273×700×40

300×760

=33.52mL
22,400 mL of N2 at STP weight = 28g
33.5 mL of nitrogen weight=

28×33.52

22400

g
Percentage of nitrogen
=

28×33.52×100

22400×0.25

=16.76%