Type 1: Determine mOsmol from weight or percent of the solute

5. mEq and mOsmol 5.2) mOsmol 5.2.1) mOsmol - General

5.2.1.1) mOsmol - General Normal 1


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A sterile solution contains 1200 mg of NaBr in each 100 mL (the MW of NaBr is 102.9). Express it as mOsmol/mL.


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lb equals 0.233 mOsmol/mL kg

    For NaBr , the 'golden formula' is:
    1 mmol = `[102.9]` mg = `[1]` mEq = `[2]` mOsmol.

    Since we need mOsmol in the numerator of the desired unit, we begin with keeping it in the numerator of the first fraction.
    Again, since 1200 mg is contained in 100 mL of solution, we keep the 1200 mg in the numerator of the second fraction for being cancelled out.
    Using dimensional analysis:
    `(2 \quad mOsmol)/(102.9 \quad mg) × (1200 \quad mg)/(100 \quad mL) = 0.2332 \quad (mOsmol)/(1 \quad mL)`.
    Therefore, it is 0.2332 mOsmol per mL. Ans.


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