Question
Asked Mar 25, 2020
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Part A
How many mmoles of Mg2+
are present in 1 L of a Normosol-R solution that contains 4.3 mEq of Mg²+ ?
Express your answer in mmoles to two significant figures.
ΑΣφ
mmoles
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Part A How many mmoles of Mg2+ are present in 1 L of a Normosol-R solution that contains 4.3 mEq of Mg²+ ? Express your answer in mmoles to two significant figures. ΑΣφ mmoles

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Expert Answer

Introduction

The term "mole" provides the information about the substance's quantity. If the values of substance's molar mass (in g/mol) and mass (in g) are known, then one can evaluate the total moles of that specific substance.

Given Data:

The volume of solution is 1 L.

The equivalent mass of Mg2+ is 4.3 mEq.

 

Calculations

It is given that the solution contains 4.3 mEq of Mg2+.

Therefore,

Chemistry homework question answer, step 2, image 1

The equivalent weight of Mg2+ ion is calculated by using the expression shown below.

Chemistry homework question answer, step 2, image 2

The molar mass of Mg2+ ion is 24 g.

Substitute the known values in the above expression.

Chemistry homework question answer, step 2, image 3

Put the value of equivalent weight of Mg2+ in the expression (I).

Chemistry homework question answer, step 2, image 4

 Therefore, 1 L of solution contains 0.052 g of Mg2+.

Now, the number of moles of Mg2+ can be calculated as shown below.

Chemistry homework question answer, step 2, image 5

Substitute the known values in the above expression.

Chemistry homework question answer, step 2, image 6

The conversion of moles into milimoles can be done as follows:

Chemistry homework question answer, step 2, image 7

...

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