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What weight of magnesium chloride (MgCl₂, formula weight 95.3; Mg, atomic weight = 24.3; Cl, atomic weight = 35.5) is required to prepare 1,000 mL of a solution that contains 5.0 mEq of magnesium?

Answer :

Answer:

238.25 mg

Step-by-step explanation:

Given:

Molar mass of MgCl₂ = 95.3

atomic weight of Mg₂ = 243

Atomic weight of Cl = 35.5

Volume of solution required = 5.0 mEq of magnesium

Now,

mEq = [tex]\frac{\textup{Weight in mg\timesValency}}{\textup{Atomic mass}}[/tex]

on substituting the values, we get

5 = [tex]\frac{\textup{Weight in mg\times2}}{\textup{95.3}}[/tex]

or

weight of magnesium chloride = 238.25 mg

Therefore,

the required mass of MgCl₂ is 238.25 mg

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