Chemistry Calculationscontinued Clinical Chemistry Review 132
FORMULA EXAMPLE
mmol/L =
mEq/L
valence
Molarity (M) =
grams per liter
GMW
Normality (N) =
grams per liter
GEW
A calcium is reported as 5 mEq/L. What is the concentration in mmol/L?
(Atomic weight of calcium = 40. Valence of calcium = 2+.)
mmol/L =^5 = 2.5
2
What is the molarity of a solution that contains 45 grams of NaCl per liter?
(Atomic weights: Na = 23, Cl = 35.5.)
M =^45 = 0.77
58.5
What is the normality of a solution that contains 98 grams of H 2 SO 4 per
500 mL? (Atomic weights: H = 1, S = 32, O = 16.)
N =^196 = 4
49
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