Question

Magnesium chloride, MgCl2, is supplied as a 50-mL vials with a concentration of 20% (w/v). Calculate the total number of millimoles of magnesium chloride in one vial. Round the final answer to the hundredths place. 1 Calculate the total number of mEq of magnesium chloride in one vial. Round the final answer to the hundredths place. 2 Calculate the total number of milli-osmols of magnesium chloride in one vial. Round the final answer to the hundredths place.

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Answer 1

Given, MgCl2, is supplied as a 50-mL vials, concentration of 20% (w/v)

20% means 20 g per 100 mL

So, 50 mL contains 10 g

1) Number of millimoles calculation

Molecular weight of MgCl2 is 95.211 g/mol

Number of moles = 10/95.211= 0.105029

Number of miliimoles = 105.03 mmol

2) Number of mEquivalents

mEq = mmol x valency

Here, valency of Mg is 2

mEq = 2 x 105.03 = 210.06 mEq

3) Number of milliosmols

Milliosmols = Total number of dissoiciable particle x millimoles

mOsmols = 3 x 105.03 = 315.09 mOsmol