<prompt> Percentage of Na in 0.9 of NaC1 -0.451.540.902.84  <response>: Ans. is a i.e., O.45Normal saline isotonic salineThis question is straightforward you can solve it even if you do not know the composition of 0.9 of NaCl 0.9 NaCl is isotonic saline.0..9NaCl means 9.0 gm of salt NaCl in one litre i.e.,0.9 Out of which Na- is half 0.45 and Cl is half 0.045 