In the equation to estimate osmolality by calculation, why is the sodium multiplied by two?
A) Sodium is present in body fluids in twice the concentration of other ions.
B) Sodium has a valence of two.
C) The equation accounts for sodium and its corresponding anion.
D) This factor accounts for the fact that sodium may be bound to chloride (NaCl) or to bicarbonate (NaHCO3) .
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