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NABP Exam NAPLEX Topic 7 Question 34 Discussion
Actual exam question for
NABP's
NAPLEX exam
Question #: 34
Topic #: 7
[All NAPLEX Questions]
Topic #: 7
Calculate the Osmolarity of 3% hypertonic saline?
Suggested Answer:
A
Osmolarity = mOsmol/L = (wt of substance (g/mL))/(MW(g/mol)) (# of particles) 1000 Weight of substance: 3% = (3g/100mL) = (xg/1000mL), x = 30g/L. # of particles NaCL: Na+ + Cl- (2 particles). mOsmol/L = (30g/L)/ (58.5g/mol) 2 1000 = 1,025.6. The answer is 1026 mOsmol/L.
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